| Year | Value | | 2022 | 22,943,670 | | 2021 | 22,231,627 | | 2020 | 21,536,999 | | 2019 | 20,825,808 | | 2018 | 20,116,288 | | 2017 | 19,446,291 | | 2016 | 18,813,145 | | 2015 | 18,234,088 | | 2014 | 17,725,827 | | 2013 | 17,250,367 | | 2012 | 16,759,069 | | 2011 | 16,199,155 | | 2010 | 15,623,358 | | 2009 | 15,080,925 | | 2008 | 14,584,657 | | 2007 | 14,158,457 | | 2006 | 13,748,303 | | 2005 | 13,344,000 | | 2004 | 12,985,072 | | 2003 | 12,637,308 | | 2002 | 12,256,939 | | 2001 | 11,863,499 | | 2000 | 11,492,980 | | 1999 | 11,129,001 | | 1998 | 10,767,442 | | 1997 | 10,428,093 | | 1996 | 10,117,575 | | 1995 | 9,823,760 | | 1994 | 9,522,717 | | 1993 | 9,248,066 | | 1992 | 8,987,967 | | 1991 | 8,716,726 | | 1990 | 8,477,310 | | 1989 | 8,248,220 | | 1988 | 8,000,565 | | 1987 | 7,744,585 | | 1986 | 7,498,842 | | 1985 | 7,292,327 | | 1984 | 7,100,879 | | 1983 | 6,923,450 | | 1982 | 6,793,499 | | 1981 | 6,721,248 | | 1980 | 6,665,115 | | 1979 | 6,571,321 | | 1978 | 6,440,655 | | 1977 | 6,293,327 | | 1976 | 6,145,637 | | 1975 | 5,999,038 | | 1974 | 5,859,409 | | 1973 | 5,733,754 | | 1972 | 5,627,354 | | 1971 | 5,521,785 | | 1970 | 5,400,377 | | 1969 | 5,269,813 | | 1968 | 5,132,786 | | 1967 | 4,990,748 | | 1966 | 4,854,437 | | 1965 | 4,729,757 | | 1964 | 4,613,144 | | 1963 | 4,502,699 | | 1962 | 4,400,406 | | 1961 | 4,303,883 | | 1960 | 4,213,106 |
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