| Year | Value | | 2022 | 19,166,393 | | 2021 | 18,533,625 | | 2020 | 17,911,897 | | 2019 | 17,306,835 | | 2018 | 16,736,895 | | 2017 | 16,208,676 | | 2016 | 15,726,480 | | 2015 | 15,291,170 | | 2014 | 14,883,443 | | 2013 | 14,480,108 | | 2012 | 14,076,486 | | 2011 | 13,674,054 | | 2010 | 13,278,920 | | 2009 | 12,890,249 | | 2008 | 12,504,571 | | 2007 | 12,118,882 | | 2006 | 11,723,444 | | 2005 | 11,310,909 | | 2004 | 10,876,916 | | 2003 | 10,436,563 | | 2002 | 10,027,510 | | 2001 | 9,669,222 | | 2000 | 9,365,341 | | 1999 | 9,108,743 | | 1998 | 8,873,786 | | 1997 | 8,635,405 | | 1996 | 8,392,104 | | 1995 | 8,158,033 | | 1994 | 7,944,097 | | 1993 | 7,752,706 | | 1992 | 7,577,098 | | 1991 | 7,425,716 | | 1990 | 7,293,632 | | 1989 | 7,160,521 | | 1988 | 7,028,953 | | 1987 | 6,900,771 | | 1986 | 6,774,290 | | 1985 | 6,652,739 | | 1984 | 6,531,419 | | 1983 | 6,405,328 | | 1982 | 6,281,107 | | 1981 | 6,173,384 | | 1980 | 6,083,134 | | 1979 | 5,985,812 | | 1978 | 5,870,363 | | 1977 | 5,755,807 | | 1976 | 5,650,529 | | 1975 | 5,546,379 | | 1974 | 5,435,969 | | 1973 | 5,318,813 | | 1972 | 5,202,180 | | 1971 | 5,095,546 | | 1970 | 4,990,781 | | 1969 | 4,878,404 | | 1968 | 4,765,885 | | 1967 | 4,655,848 | | 1966 | 4,548,281 | | 1965 | 4,443,337 | | 1964 | 4,339,902 | | 1963 | 4,239,102 | | 1962 | 4,141,508 | | 1961 | 4,047,799 | | 1960 | 3,960,645 |
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