| Year | Value | | 2024 | 24,156,317 | | 2023 | 23,701,050 | | 2022 | 23,244,095 | | 2021 | 22,824,157 | | 2020 | 22,436,859 | | 2019 | 22,024,333 | | 2018 | 21,595,690 | | 2017 | 21,172,895 | | 2016 | 20,744,347 | | 2015 | 20,323,082 | | 2014 | 19,899,491 | | 2013 | 19,475,818 | | 2012 | 19,062,486 | | 2011 | 18,655,968 | | 2010 | 18,252,913 | | 2009 | 17,839,830 | | 2008 | 17,422,916 | | 2007 | 17,010,255 | | 2006 | 16,600,228 | | 2005 | 16,195,546 | | 2004 | 15,822,349 | | 2003 | 15,480,992 | | 2002 | 15,143,982 | | 2001 | 14,808,169 | | 2000 | 14,469,468 | | 1999 | 14,128,964 | | 1998 | 13,789,501 | | 1997 | 13,451,388 | | 1996 | 13,114,905 | | 1995 | 12,762,620 | | 1994 | 12,398,508 | | 1993 | 12,040,866 | | 1992 | 11,683,111 | | 1991 | 11,329,295 | | 1990 | 10,980,994 | | 1989 | 10,639,887 | | 1988 | 10,307,185 | | 1987 | 9,979,674 | | 1986 | 9,662,692 | | 1985 | 9,349,414 | | 1984 | 9,041,761 | | 1983 | 8,750,097 | | 1982 | 8,474,330 | | 1981 | 8,213,330 | | 1980 | 7,965,459 | | 1979 | 7,731,443 | | 1978 | 7,512,615 | | 1977 | 7,307,575 | | 1976 | 7,112,159 | | 1975 | 6,926,247 |
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