| Year | Value | | 2022 | 17,341,833 | | 2021 | 17,166,530 | | 2020 | 16,986,172 | | 2019 | 16,794,024 | | 2018 | 16,597,324 | | 2017 | 16,391,213 | | 2016 | 16,171,861 | | 2015 | 15,947,910 | | 2014 | 15,720,763 | | 2013 | 15,488,512 | | 2012 | 15,254,994 | | 2011 | 15,021,118 | | 2010 | 14,792,312 | | 2009 | 14,530,672 | | 2008 | 14,226,719 | | 2007 | 13,912,833 | | 2006 | 13,592,989 | | 2005 | 13,271,796 | | 2004 | 12,947,693 | | 2003 | 12,621,130 | | 2002 | 12,292,325 | | 2001 | 11,961,265 | | 2000 | 11,631,359 | | 1999 | 11,326,235 | | 1998 | 11,044,606 | | 1997 | 10,761,106 | | 1996 | 10,477,978 | | 1995 | 10,198,689 | | 1994 | 9,921,365 | | 1993 | 9,648,873 | | 1992 | 9,384,297 | | 1991 | 9,126,944 | | 1990 | 8,874,067 | | 1989 | 8,623,302 | | 1988 | 8,373,510 | | 1987 | 8,125,834 | | 1986 | 7,886,831 | | 1985 | 7,659,684 | | 1984 | 7,447,087 | | 1983 | 7,248,756 | | 1982 | 7,061,416 | | 1981 | 6,881,926 | | 1980 | 6,706,385 | | 1979 | 6,535,024 | | 1978 | 6,368,557 | | 1977 | 6,205,309 | | 1976 | 6,049,825 | | 1975 | 5,902,426 | | 1974 | 5,759,824 | | 1973 | 5,622,394 | | 1972 | 5,490,829 | | 1971 | 5,365,364 | | 1970 | 5,241,436 | | 1969 | 5,118,190 | | 1968 | 4,997,249 | | 1967 | 4,876,880 | | 1966 | 4,755,181 | | 1965 | 4,629,885 | | 1964 | 4,501,673 | | 1963 | 4,372,658 | | 1962 | 4,244,424 | | 1961 | 4,119,275 | | 1960 | 3,998,586 |
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