| Year | Value | | 2022 | 22,654,158 | | 2021 | 21,689,001 | | 2020 | 20,958,114 | | 2019 | 20,344,915 | | 2018 | 19,859,678 | | 2017 | 19,491,573 | | 2016 | 19,120,546 | | 2015 | 18,802,299 | | 2014 | 18,604,052 | | 2013 | 18,428,208 | | 2012 | 18,129,637 | | 2011 | 17,660,238 | | 2010 | 17,104,396 | | 2009 | 16,519,685 | | 2008 | 15,907,468 | | 2007 | 15,326,910 | | 2006 | 14,797,807 | | 2005 | 14,284,696 | | 2004 | 13,815,376 | | 2003 | 13,330,723 | | 2002 | 12,805,697 | | 2001 | 12,355,525 | | 2000 | 11,922,922 | | 1999 | 11,420,641 | | 1998 | 10,905,162 | | 1997 | 10,463,177 | | 1996 | 10,077,534 | | 1995 | 9,698,568 | | 1994 | 9,371,827 | | 1993 | 9,112,419 | | 1992 | 8,829,197 | | 1991 | 8,504,734 | | 1990 | 8,199,456 | | 1989 | 7,911,794 | | 1988 | 7,628,956 | | 1987 | 7,393,756 | | 1986 | 7,223,281 | | 1985 | 7,068,768 | | 1984 | 6,877,335 | | 1983 | 6,675,114 | | 1982 | 6,496,658 | | 1981 | 6,305,230 | | 1980 | 6,068,990 | | 1979 | 5,784,136 | | 1978 | 5,463,885 | | 1977 | 5,154,259 | | 1976 | 4,874,537 | | 1975 | 4,632,750 | | 1974 | 4,455,794 | | 1973 | 4,315,492 | | 1972 | 4,178,175 | | 1971 | 4,033,703 | | 1970 | 3,869,994 | | 1969 | 3,713,828 | | 1968 | 3,578,654 | | 1967 | 3,457,822 | | 1966 | 3,365,933 | | 1965 | 3,299,906 | | 1964 | 3,235,668 | | 1963 | 3,168,130 | | 1962 | 3,112,944 | | 1961 | 3,120,662 | | 1960 | 3,225,170 |
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