| Year | Value | | 2022 | 17,153,490 | | 2021 | 16,887,042 | | 2020 | 16,645,299 | | 2019 | 16,411,800 | | 2018 | 16,170,894 | | 2017 | 15,910,948 | | 2016 | 15,618,909 | | 2015 | 15,286,440 | | 2014 | 14,911,459 | | 2013 | 14,501,580 | | 2012 | 14,072,607 | | 2011 | 13,638,993 | | 2010 | 13,210,422 | | 2009 | 12,798,702 | | 2008 | 12,387,718 | | 2007 | 11,988,817 | | 2006 | 11,603,122 | | 2005 | 11,231,532 | | 2004 | 10,867,745 | | 2003 | 10,491,626 | | 2002 | 10,100,512 | | 2001 | 9,704,201 | | 2000 | 9,303,330 | | 1999 | 8,913,802 | | 1998 | 8,564,238 | | 1997 | 8,259,482 | | 1996 | 7,991,138 | | 1995 | 7,756,875 | | 1994 | 7,547,812 | | 1993 | 7,353,438 | | 1992 | 7,166,477 | | 1991 | 6,983,934 | | 1990 | 6,805,301 | | 1989 | 6,637,026 | | 1988 | 6,485,454 | | 1987 | 6,348,584 | | 1986 | 6,222,766 | | 1985 | 6,104,723 | | 1984 | 5,990,371 | | 1983 | 5,873,600 | | 1982 | 5,750,497 | | 1981 | 5,619,326 | | 1980 | 5,479,546 | | 1979 | 5,331,697 | | 1978 | 5,176,640 | | 1977 | 5,015,744 | | 1976 | 4,854,170 | | 1975 | 4,693,738 | | 1974 | 4,532,415 | | 1973 | 4,372,044 | | 1972 | 4,220,326 | | 1971 | 4,086,750 | | 1970 | 3,977,646 | | 1969 | 3,890,646 | | 1968 | 3,819,852 | | 1967 | 3,758,547 | | 1966 | 3,696,278 | | 1965 | 3,624,745 | | 1964 | 3,541,194 | | 1963 | 3,445,771 | | 1962 | 3,341,437 | | 1961 | 3,234,521 | | 1960 | 3,130,641 |
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