| Year | Value | | 2022 | 26,207,977 | | 2021 | 25,252,722 | | 2020 | 24,333,639 | | 2019 | 23,443,393 | | 2018 | 22,577,058 | | 2017 | 21,737,922 | | 2016 | 20,921,743 | | 2015 | 20,128,124 | | 2014 | 19,372,014 | | 2013 | 18,653,199 | | 2012 | 17,954,407 | | 2011 | 17,283,112 | | 2010 | 16,647,543 | | 2009 | 16,037,915 | | 2008 | 15,455,175 | | 2007 | 14,897,873 | | 2006 | 14,365,168 | | 2005 | 13,855,221 | | 2004 | 13,366,885 | | 2003 | 12,900,790 | | 2002 | 12,456,517 | | 2001 | 12,031,430 | | 2000 | 11,622,665 | | 1999 | 11,231,469 | | 1998 | 10,854,920 | | 1997 | 10,494,201 | | 1996 | 10,149,937 | | 1995 | 9,813,918 | | 1994 | 9,493,324 | | 1993 | 9,193,078 | | 1992 | 8,907,644 | | 1991 | 8,634,640 | | 1990 | 8,370,648 | | 1989 | 8,116,075 | | 1988 | 7,872,252 | | 1987 | 7,636,591 | | 1986 | 7,408,364 | | 1985 | 7,187,618 | | 1984 | 6,973,849 | | 1983 | 6,766,606 | | 1982 | 6,564,445 | | 1981 | 6,366,262 | | 1980 | 6,173,177 | | 1979 | 5,987,151 | | 1978 | 5,810,351 | | 1977 | 5,644,703 | | 1976 | 5,488,658 | | 1975 | 5,339,497 | | 1974 | 5,196,579 | | 1973 | 5,059,382 | | 1972 | 4,926,318 | | 1971 | 4,797,068 | | 1970 | 4,669,708 | | 1969 | 4,542,993 | | 1968 | 4,417,954 | | 1967 | 4,294,283 | | 1966 | 4,172,501 | | 1965 | 4,053,524 | | 1964 | 3,937,008 | | 1963 | 3,822,697 | | 1962 | 3,711,068 | | 1961 | 3,602,530 | | 1960 | 3,497,431 |
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