Because the Smithsonian museums are free, we cannot base our visit tallies on a number of tickets sold.
Smithsonian security officers use hand clickers to count everyone entering the museums (in some buildings they count people leaving) through public entrances during the hours the museums are open. The counts sometimes include staff, as well as visitors who leave the museum and return. A person visiting three Smithsonian museums on any given day will be counted three times. For these reasons, we always refer to the numbers below as "visits" rather than "visitors." The newest Smithsonian museum, the National Museum of African American History and Culture (NMAAHC), has an automated counting system that counts visitors (and staff) as they enter the museum.
Visit numbers are compiled on a calendar-year basis. Since 2001, the total visits to the Smithsonian have also reflected the number of visits to the National Zoo.
Numbers are rounded to the nearest thousand or tenth of a million (M), depending on volume.
2020
All Smithsonian museums and the National Zoo closed to the public on March 14, 2020 due to COVID-19. Seven museums and the National Zoo reopened in phases between July and Sept. with timed tickets and a limited schedule. The museums and the National Zoo closed again on Nov. 23.
Totals for 2020
| Smithsonian American Art Museum (With the Renwick Gallery) | 387,403 |
| National Portrait Gallery | 321,286 |
| National Museum of African American History and Culture | 367,727 |
| National Museum of African Art | 23,111 |
| National Air and Space Museum | 267,003 |
| National Air and Space Museum's Steven F. Udvar-Hazy Center | 311,548 |
| National Museum of American History | 310,645 |
| National Museum of the American Indian (Washington, D.C.) | 143,532 |
| National Museum of the American Indian Heye Center (New York City) | 49,646 |
| Anacostia Community Museum | 6,137 |
| Arts and Industries Building | 0 |
| Cooper Hewitt, Smithsonian Design Museum | 38,582 |
| Hirshhorn Museum and Sculpture Garden | 133,050 |
| National Museum of Natural History | 572,638 |
| Renwick Gallery of the Smithsonian American Art Museum | 66,117 |
| S. Dillon Ripley Center | 27,188 |
| Smithsonian Institution Building, "The Castle" | 100,002 |
| Arthur M. Sackler Gallery | 30,051 |
| Freer Gallery of Art | 49,280 |
| National Postal Museum | 84,862 |
| National Zoo | 356,463 |
| Total Visits in 2020 | 3.3 M |
2019
Totals for 2019
| Smithsonian American Art Museum (With the Renwick Gallery) | 2M |
| National Portrait Gallery | 1.7M |
| National Museum of African American History and Culture | 2M |
| National Museum of African Art | 129,572 |
| National Air and Space Museum | 3.2M |
| National Air and Space Museum's Steven F. Udvar-Hazy Center | 1.3M |
| National Museum of American History | 2.8M |
| National Museum of the American Indian (Washington, D.C.) | 960,933 |
| National Museum of the American Indian Heye Center (New York City) | 348,599 |
| Anacostia Community Museum | 8,034 |
| Arts and Industries Building | 25,967 |
| Cooper Hewitt, Smithsonian Design Museum | 263,637 |
| Hirshhorn Museum and Sculpture Garden | 891,114 |
| National Museum of Natural History | 4.2M |
| Renwick Gallery of the Smithsonian American Art Museum | 314,068 |
| S. Dillon Ripley Center | 144,169 |
| Smithsonian Institution Building, "The Castle" | 965,512 |
| Arthur M. Sackler Gallery | 148,242 |
| Freer Gallery of Art | 298,094 |
| National Postal Museum | 501,204 |
| National Zoo | 1.8M |
| Total Visits in 2019 | 22.1M |
2018
Totals for 2018
| Smithsonian American Art Museum (With the Renwick Gallery) | 3.15M |
| National Portrait Gallery | 2.3M |
| National Museum of African American History and Culture | 1.9M |
| National Museum of African Art | 141,890 |
| National Air and Space Museum | 6.2M |
| National Air and Space Museum's Steven F. Udvar-Hazy Center | 1.5M |
| National Museum of American History | 4.1M |
| National Museum of the American Indian (Washington, D.C.) | 1.1M |
| National Museum of the American Indian Heye Center (New York City) | 405,989 |
| Anacostia Community Museum | 33,709 |
| Arts and Industries Building | 19,341 |
| Cooper Hewitt, Smithsonian Design Museum | 316,957 |
| Hirshhorn Museum and Sculpture Garden | 881,553 |
| National Museum of Natural History | 4.8M |
| Renwick Gallery of the Smithsonian American Art Museum | 849,515 |
| S. Dillon Ripley Center | 133,767 |
| Smithsonian Institution Building, "The Castle" | 1M |
| Arthur M. Sackler Gallery | 133,503 |
| Freer Gallery of Art | 282,755 |
| National Postal Museum | 495,961 |
| National Zoo | 1.8M |
| Total Visits in 2018 | 28.5M |
2017
| Donald W. Reynolds Center for American Art and Portraiture (Smithsonian American Art Museum and The National Portrait Gallery) |
1.3M |
| National Museum of African American History and Culture | 2.4M |
| National Museum of African Art | 159,000 |
| National Air and Space Museum | 7M |
| National Air and Space Museum's Steven F. Udvar-Hazy Center | 1.6M |
| National Museum of American History | 3.8M |
| National Museum of the American Indian (Washington, D.C.) | 1.2M |
| National Museum of the American Indian Heye Center (New York City) | 437,000 |
| Anacostia Community Museum | 37,000 |
| Arts and Industries Building | 59,000 |
| Cooper Hewitt, Smithsonian Design Museum | 338,000 |
| Hirshhorn Museum and Sculpture Garden | 1.1M |
| National Museum of Natural History | 6M |
| Renwick Gallery of the Smithsonian American Art Museum | 414,000 |
| S. Dillon Ripley Center | 161,000 |
| Smithsonian Institution Building, "The Castle" | 1.1M |
| Arthur M. Sackler Gallery | 178,000 |
| Freer Gallery of Art | 75,000 |
| National Postal Museum | 486,000 |
| National Zoo | 2M |
| Total Visits in 2017 | 30M |
2016
| Donald W. Reynolds Center for American Art and Portraiture (Smithsonian American Art Museum and The National Portrait Gallery) |
1.2M |
| National Museum of African American History and Culture | 733,000 |
| National Museum of African Art | 206,000 |
| National Air and Space Museum | 7.5M |
| National Air and Space Museum's Steven F. Udvar-Hazy Center | 1.6M |
| National Museum of American History | 3.8M |
| National Museum of the American Indian (Washington, D.C.) | 1.1M |
| National Museum of the American Indian Heye Center (New York City) | 474,000 |
| Anacostia Community Museum | 28,000 |
| Arts and Industries Building | 64,000 |
| Cooper Hewitt, Smithsonian Design Museum | 418,000 |
| Hirshhorn Museum and Sculpture Garden | 659,000 |
| National Museum of Natural History | 7.1M |
| Renwick Gallery of the Smithsonian American Art Museum | 764,000 |
| S. Dillon Ripley Center | 166,000 |
| Smithsonian Institution Building, "The Castle" | 1.1M |
| Arthur M. Sackler Gallery | 213,000 |
| Freer Gallery of Art | 10,000 |
| National Postal Museum | 398,000 |
| National Zoo | 2.7M |
| Total Visits in 2016 | 30.2M |
2015
| Donald W. Reynolds Center for American Art and Portraiture (Smithsonian American Art Museum and The National Portrait Gallery) |
1.3M |
| National Museum of African Art | 213,000 |
| National Air and Space Museum | 6.9M |
| National Air and Space Museum's Steven F. Udvar-Hazy Center | 1.6M |
| National Museum of American History | 4.1M |
| National Museum of the American Indian (Washington, D.C.) | 1.2M |
| National Museum of the American Indian Heye Center (New York City) | 486,000 |
| Anacostia Community Museum | 30,000 |
| Arts and Industries Building | Closed for renovation |
| Cooper-Hewitt, National Museum of Design (New York City) | 265,000 |
| Hirshhorn Museum and Sculpture Garden | 681,000 |
| National Museum of Natural History | 6.9M |
| Renwick Gallery of the Smithsonian American Art Museum | 164,000 |
| S. Dillon Ripley Center | 145,000 |
| Smithsonian Institution Building, "The Castle" | 1.1M |
| Arthur M. Sackler Gallery | 150,000 |
| Freer Gallery of Art | 389,000 |
| National Postal Museum | 357,000 |
| National Zoo | 2.2M |
| Total Visits in 2015 | 28.2M |
2014
| Donald W. Reynolds Center for American Art and Portraiture (Smithsonian American Art Museum and The National Portrait Gallery) |
1.1m |
| National Museum of African Art | 203k |
| National Air and Space Museum | 6.7m |
| National Air and Space Museum's Steven F. Udvar-Hazy Center | 1.3m |
| National Museum of American History | 4m |
| National Museum of the American Indian (Washington, D.C.) | 1.3m |
| National Museum of the American Indian Heye Center (New York City) | 584kk |
| Anacostia Community Museum | 42k |
| Arts and Industries Building | Closed for renovation |
| Cooper-Hewitt, National Museum of Design (New York City) | 27k |
| Hirshhorn Museum and Sculpture Garden | 552k |
| National Museum of Natural History | 7.3m |
| Renwick Gallery of the Smithsonian American Art Museum | Closed for renovation |
| S. Dillon Ripley Center | 146k |
| Smithsonian Institution Building, "The Castle" | 1.2m |
| Arthur M. Sackler Gallery | 182k |
| Freer Gallery of Art | 371k |
| National Postal Museum | 401k |
| National Zoo | 2.5m |
| Total Visits in 2014 | 28m |
2013
| Donald W. Reynolds Center for American Art and Portraiture (Smithsonian American Art Museum and The National Portrait Gallery) |
1.1M |
| National Museum of African Art | 216k |
| National Air and Space Museum | 7.0M |
| National Air and Space Museum's Steven F. Udvar-Hazy Center | 1.3M |
| National Museum of American History | 4.9M |
| National Museum of the American Indian (Washington, D.C.) | 1.4M |
| National Museum of the American Indian Heye Center (New York City) | 595k |
| Anacostia Community Museum | 38k |
| Arts and Industries Building | Closed for renovation |
| Cooper-Hewitt, National Museum of Design (New York City) | Closed for renovation |
| Hirshhorn Museum and Sculpture Garden | 645k |
| National Museum of Natural History | 8.0M |
| Renwick Gallery of the Smithsonian American Art Museum | 122k |
| S. Dillon Ripley Center | 198k |
| Smithsonian Institution Building, "The Castle" | 1.3M |
| Arthur M. Sackler Gallery | 217k |
| Freer Gallery of Art | 396k |
| National Postal Museum | 288k |
| National Zoo | 2.0M |
| Total Visits in 2013 | 30.0M |
2012
| Donald W. Reynolds Center for American Art and Portraiture (Smithsonian American Art Museum and The National Portrait Gallery) |
1M |
| National Museum of African Art | 353,959 |
| National Air and Space Museum | 6.8M |
| National Air and Space Museum's Steven F. Udvar-Hazy Center | 1.4M |
| National Museum of American History | 4.8M |
| National Museum of the American Indian (Washington, D.C.) | 1.6M |
| National Museum of the American Indian Heye Center (New York City) | 441,397 |
| Anacostia Community Museum | 31,168 |
| Arts and Industries Building | Closed for renovation |
| Cooper-Hewitt, National Museum of Design (New York City) | Closed for renovation |
| Hirshhorn Museum and Sculpture Garden | 753,258 |
| National Museum of Natural History | 7.6M |
| Renwick Gallery of the Smithsonian American Art Museum | 162,051 |
| S. Dillon Ripley Center | 465,654 |
| Smithsonian Institution Building, "The Castle" | 1.4M |
| Arthur M. Sackler Gallery | 359,813 |
| Freer Gallery of Art | 509,930 |
| National Postal Museum | 321,953 |
| National Zoo | 2.3M |
| Total Visits in 2012 | 30.3M |
2011
| Donald W. Reynolds Center for American Art and Portraiture (Smithsonian American Art Museum and The National Portrait Gallery) |
948,345 |
| National Museum of African Art | 384,693 |
| National Air and Space Museum | 7 million |
| National Air and Space Museum's Steven F. Udvar-Hazy Center | 1.2 million |
| National Museum of American History | 4.6 million |
| National Museum of the American Indian (Washington, D.C.) | 1.4 million |
| National Museum of the American Indian Heye Center (New York City) | 365,512 |
| Anacostia Community Museum | 48,230 |
| Arts and Industries Building | Closed for renovation |
| Cooper-Hewitt, National Museum of Design (New York City) (Closed for renovation 7/2011) | 190,752 |
| Hirshhorn Museum and Sculpture Garden | 623,039 |
| National Museum of Natural History | 6.6 million |
| Renwick Gallery of the Smithsonian American Art Museum | 164,925 |
| S. Dillon Ripley Center | 464,315 |
| Smithsonian Institution Building, "The Castle" | 1.5 million |
| Arthur M. Sackler Gallery | 387,694 |
| Freer Gallery of Art | 557,983 |
| National Postal Museum | 325,900 |
| National Zoo | 1.9 million |
| Total Visits in 2011 | 28.6 million |
2010
| Anacostia Community Museum | 58,000 |
| Arts and Industries Building | Closed for renovation |
| Cooper-Hewitt, National Museum of Design (New York City) | 181,000 |
| Donald W. Reynolds Center for American Art and Portraiture (Smithsonian American Art Museum and The National Portrait Gallery) |
1.1 million |
| Freer Gallery of Art | 488,000 |
| Hirshhorn Museum and Sculpture Garden | 621,000 |
| National Air and Space Museum | 8.3 million |
| National Air and Space Museum's Steven F. Udvar-Hazy Center | 1.1 million |
| National Museum of African Art | 310,000 |
| National Museum of American History | 4.2 million |
| National Museum of the American Indian (Washington, D.C.) | 1.3 million |
| National Museum of the American Indian Heye Center (New York City) | 300,000 |
| National Museum of Natural History | 6.8 million |
| National Zoo | 2.3 million |
| National Postal Museum | 343,000 |
| Renwick Gallery of the Smithsonian American Art Museum | 151,000 |
| Arthur M. Sackler Gallery | 308,000 |
| S. Dillon Ripley Center | 363,000 |
| Smithsonian Institution Building, "The Castle" | 1.8 million |
| Total Visits in 2010 | 30.2 million |
2009
| Anacostia Community Museum | 34,000 |
| Arts and Industries Building | Closed for renovation |
| Cooper-Hewitt, National Museum of Design (New York City) | 172,000 |
| Donald W. Reynolds Center for American Art and Portraiture (Smithsonian American Art Museum and The National Portrait Gallery) |
1 million |
| Freer Gallery of Art | 634,000 |
| Hirshhorn Museum and Sculpture Garden | 668,000 |
| National Air and Space Museum | 7 million |
| National Air and Space Museum's Steven F. Udvar-Hazy Center | 440,000 |
| National Museum of African Art | 403,000 |
| National Museum of American History | 4.4 million |
| National Museum of the American Indian (Washington, D.C.) | 1.4 million |
| National Museum of the American Indian Heye Center (New York City) | 286,000 |
| National Museum of Natural History | 7.4 million |
| National Zoo | 2.2 million |
| National Postal Museum | 349,000 |
| Renwick Gallery of the Smithsonian American Art Museum | 161,000 |
| Arthur M. Sackler Gallery | 349,000 |
| S. Dillon Ripley Center | 439,000 |
| Smithsonian Institution Building, "The Castle" | 1.9 million |
| Total Visits in 2009 | 30 million |
2008
| Anacostia Community Museum | 36,000 |
| Arts and Industries Building | Closed for renovation |
| Cooper-Hewitt, National Museum of Design (New York City) | 154,000 |
| Donald W. Reynolds Center for American Art and Portraiture (Smithsonian American Art Museum and The National Portrait Gallery) |
1 million |
| Freer Gallery of Art | 603,000 |
| Hirshhorn Museum and Sculpture Garden | 670,000 |
| National Air and Space Museum | 7 million |
| National Air and Space Museum's Steven F. Udvar-Hazy Center | 1.2 million |
| National Museum of African Art | 322,000 |
| National Museum of American History | 480,000 (reopened Nov. 21 after a 2-year renovation) |
| National Museum of the American Indian (Washington, D.C.) | 1.5 million |
| National Museum of the American Indian Heye Center (New York City) | 306,000 |
| National Museum of Natural History | 7 million |
| National Zoo | 2.1 million |
| National Postal Museum | 334,000 |
| Renwick Gallery of the Smithsonian American Art Museum | 137,000 |
| Arthur M. Sackler Gallery | 288,000 |
| S. Dillon Ripley Center | 453,000 |
| Smithsonian Institution Building, "The Castle" | 1.7 million |
| Total Visits in 2008 | 25.2 million |
2007
| Anacostia Community Museum | 37,000 |
| Arts and Industries Building | Closed for renovation |
| Cooper-Hewitt, National Museum of Design (New York City) | 224,000 |
| Donald W. Reynolds Center for American Art and Portraiture (Smithsonian American Art Museum and The National Portrait Gallery) |
786,000 |
| Freer Gallery of Art | 590,000 |
| Hirshhorn Museum and Sculpture Garden | 740,000 |
| National Air and Space Museum | 6 million |
| National Air and Space Museum's Steven F. Udvar-Hazy Center | 1 million |
| National Museum of African Art | 310,000 |
| National Museum of American History | Closed for renovation |
| National Museum of the American Indian (Washington, D.C.) | 1.8 million |
| National Museum of the American Indian Heye Center (New York City) | 281,000 |
| National Museum of Natural History | 7.1 million |
| National Zoo | 2.6 million |
| National Postal Museum | 326,000 |
| Renwick Gallery of the Smithsonian American Art Museum | 132,000 |
| Arthur M. Sackler Gallery | 308,000 |
| S. Dillon Ripley Center | 296,000 |
| Smithsonian Institution Building, "The Castle" | 1.6 million |
| Total Visits in 2007 | 24.2 million |
2006
| Anacostia Community Museum | 46,000 |
| Arts and Industries Building | Closed for renovation |
| Cooper-Hewitt, National Museum of Design (New York City) | 207,000 |
| Donald W. Reynolds Center for American Art and Portraiture (Smithsonian American Art Museum and The National Portrait Gallery) |
480,000 (for last 6 months only) |
| Freer Gallery of Art | 462,000 |
| Hirshhorn Museum and Sculpture Garden | 757,000 |
| National Air and Space Museum | 5 million |
| National Air and Space Museum's Steven F. Udvar-Hazy Center | 1 million |
| National Museum of African Art | 211,000 |
| National Museum of American History | 2.4 million Closed for renovation |
| National Museum of the American Indian (Washington, D.C.) | 1.6 million |
| National Museum of the American Indian Heye Center (New York City) | 240,000 |
| National Museum of Natural History | 5.8 million |
| National Zoo | 2.6 million |
| National Postal Museum | 390,000 |
| Renwick Gallery of the Smithsonian American Art Museum | 155,000 |
| Arthur M. Sackler Gallery | 260,000 |
| S. Dillon Ripley Center | 241,000 |
| Smithsonian Institution Building, "The Castle" | 1.3 million |
| Total Visits in 2006 | 23.2 million |
2005 - 2001
2005
| Totals for 2005 | |
|---|---|
| Anacostia Community Museum | 25,000 |
| Arts and Industries Building | Closed for renovation |
| Cooper-Hewitt, National Museum of Design (New York City) | 129,000 |
| Freer Gallery of Art | 323,000 |
| Hirshhorn Museum and Sculpture Garden | 699,000 |
| National Air and Space Museum | 6.1 million |
| National Air and Space Museum's Steven F. Udvar-Hazy Center | 1.2 million |
| National Museum of African Art | 158,000 |
| National Museum of American History | 3.0 million |
| National Museum of the American Indian (Washington, D.C.) | 2.2 million |
| National Museum of the American Indian Heye Center (New York City) | 299,000 |
| National Museum of Natural History | 5.6 million |
| National Portrait Gallery and Smithsonian American Art | Closed for renovation |
| National Zoo | 1.8 million |
| National Postal Museum | 519,000 |
| Renwick Gallery of the Smithsonian American Art Museum | 143,000 |
| Arthur M. Sackler Gallery | 147,000 |
| S. Dillon Ripley Center | 198,000 |
| Smithsonian Institution Building, "The Castle" | 1.3 million |
| Total Visits in 2005 | 24 million |
2004
| Totals for 2004 | |
|---|---|
| Anacostia Community Museum | 22,000 |
| Arts and Industries Building | Closed for renovation |
| Cooper-Hewitt, National Museum of Design (New York City) | 150,000 |
| Freer Gallery of Art | 355,000 |
| Hirshhorn Museum and Sculpture Garden | 659,000 |
| National Air and Space Museum | 4.9 million |
| National Air and Space Museum's Steven F. Udvar-Hazy Center | 1.6 million |
| National Museum of African Art | 165,000 |
| National Museum of American History | 2.9 million |
| National Museum of the American Indian (Washington, D.C.) | 820,000 |
| National Museum of the American Indian Heye Center (New York City) | 254,000 |
| National Museum of Natural History | 4.4 million |
| National Portrait Gallery and Smithsonian American Art | Closed for renovation |
| National Zoo | 1.8 million |
| National Postal Museum | 353,000 |
| Renwick Gallery of the Smithsonian American Art Museum | 115,000 |
| Arthur M. Sackler Gallery | 188,000 |
| S. Dillon Ripley Center | 178,000 |
| Smithsonian Institution Building, "The Castle" | 1.5 million |
| Total Visits in 2004 | 20.4 million |
2003
| Totals for 2003 | |
|---|---|
| Anacostia Community Museum | 29,000 |
| Arts and Industries Building | 886,000 |
| Cooper-Hewitt, National Museum of Design (New York City) | 149,000 |
| Freer Gallery of Art | 315,000 |
| Hirshhorn Museum and Sculpture Garden | 660,000 |
| National Air and Space Museum | 9.4 million |
| National Air and Space Museum's Steven F. Udvar-Hazy Center | 220,000 |
| National Museum of African Art | 170,000 |
| National Museum of American History | 2.6 million |
| National Museum of the American Indian Heye Center (New York City) | 266,000 |
| National Museum of Natural History | 5.2 million |
| National Portrait Gallery and Smithsonian American Art | Closed for renovation |
| National Zoo | 1.8 million |
| National Postal Museum | 313,000 |
| Renwick Gallery of the Smithsonian American Art Museum | 168,000 |
| Arthur M. Sackler Gallery | 162,000 |
| S. Dillon Ripley Center | 239,000 |
| Smithsonian Institution Building, "The Castle" | 1.1 million |
| Total Visits in 2003 | 24 million |
2002
| Totals for 2002 | |
|---|---|
| Anacostia Community Museum | 31,000 |
| Arts and Industries Building | 900,000 |
| Cooper-Hewitt, National Museum of Design (New York City) | 136,000 |
| Freer Gallery of Art | 405,000 |
| Hirshhorn Museum and Sculpture Garden | 691,000 |
| National Air and Space Museum | 8,500,000 |
| National Museum of African Art | 179,000 |
| National Museum of American History | 4,200,000 |
| National Museum of the American Indian Heye Center (New York City) | 340,000 |
| National Museum of Natural History | 6,260,000 |
| National Portrait Gallery and Smithsonian American Art | Closed for renovation |
| National Postal Museum | 321,000 |
| Renwick Gallery of the Smithsonian American Art Museum | 150,000 |
| Arthur M. Sackler Gallery | 214,000 |
| S. Dillon Ripley Center | 280,000 |
| Smithsonian Institution Building, "The Castle" | 1,600,000 |
| Total Visits in 2002 | 26.3 million |
2001
| Totals for 2001 | |
|---|---|
| Anacostia Community Museum | Closed for renovation |
| Arts and Industries Building | 1.2 million |
| Cooper-Hewitt, National Museum of Design (New York City) | 138,000 |
| Freer Gallery of Art | 295,000 |
| Hirshhorn Museum and Sculpture Garden | 718,000 |
| National Air and Space Museum | 9.3 million |
| National Museum of African Art | 208,000 |
| National Museum of American History | 5.2 million |
| National Museum of the American Indian Heye Center (New York City) | 361,000 |
| National Museum of Natural History | 8.4 million |
| National Portrait Gallery and Smithsonian American Art | Closed for renovation |
| National Postal Museum | 377,000 |
| Renwick Gallery of the Smithsonian American Art Museum | 141,000 |
| Arthur M. Sackler Gallery | 188,000 |
| S. Dillon Ripley Center | 489,000 |
| Smithsonian Institution Building, "The Castle" | 1.8 million |
| Total Visits in 2001 | 31.7 million |
2000 - 1970
| Total Visits, 1970-2000 | |
|---|---|
| 2000 | 31.1 million |
| 1999 | 28.5 million |
| 1998 | 28.6 million |
| 1997 | 27.4 million |
| 1996 | 22.4 million |
| 1995 | 23.6 million |
| 1994 | 24.7 million |
| 1993 | 25.9 million |
| 1992 | 26.6 million |
| 1991 | 25 million |
| 1990 | 25 million |
| 1989 | 24 million |
| 1988 | 28 million |
| 1987 | 27 million |
| 1986 | 22.7 million |
| 1985 | 23.7 million |
| 1984 | 30.1 million |
| 1983 | 25.8 million |
| 1982 | 22.6 million |
| 1981 | 22.1 million |
| 1980 | 21.1 million |
| 1979 | 23.1 million |
| 1978 | 24.7 milllion |
| 1977 | 22.9 million |
| 1976 | 20.4 million |
| 1975 | 17.8 million |
| 1974 | 14.3 million |
| 1973 | 15 million |
| 1972 | 15 million |
| 1971 | 14.3 million |
| 1970 | 13.4 |
