| Year | Value | | 2022 | 16,629,794 | | 2021 | 16,356,095 | | 2020 | 16,051,148 | | 2019 | 15,691,365 | | 2018 | 15,289,539 | | 2017 | 14,868,966 | | 2016 | 14,436,327 | | 2015 | 13,992,455 | | 2014 | 13,540,102 | | 2013 | 13,085,029 | | 2012 | 12,633,941 | | 2011 | 12,195,806 | | 2010 | 11,777,120 | | 2009 | 11,377,416 | | 2008 | 10,958,344 | | 2007 | 10,529,659 | | 2006 | 10,101,848 | | 2005 | 9,672,679 | | 2004 | 9,257,592 | | 2003 | 8,885,158 | | 2002 | 8,559,238 | | 2001 | 8,271,135 | | 2000 | 8,018,775 | | 1999 | 7,794,893 | | 1998 | 7,590,414 | | 1997 | 7,396,465 | | 1996 | 7,210,350 | | 1995 | 7,031,116 | | 1994 | 6,858,101 | | 1993 | 6,695,862 | | 1992 | 6,547,568 | | 1991 | 6,409,794 | | 1990 | 6,281,053 | | 1989 | 6,161,120 | | 1988 | 6,042,500 | | 1987 | 5,917,357 | | 1986 | 5,782,866 | | 1985 | 5,637,700 | | 1984 | 5,481,056 | | 1983 | 5,312,923 | | 1982 | 5,136,964 | | 1981 | 4,960,220 | | 1980 | 4,786,897 | | 1979 | 4,615,922 | | 1978 | 4,447,621 | | 1977 | 4,289,074 | | 1976 | 4,148,716 | | 1975 | 4,029,869 | | 1974 | 3,931,025 | | 1973 | 3,850,150 | | 1972 | 3,780,746 | | 1971 | 3,711,975 | | 1970 | 3,636,066 | | 1969 | 3,549,532 | | 1968 | 3,451,043 | | 1967 | 3,343,815 | | 1966 | 3,234,674 | | 1965 | 3,128,214 | | 1964 | 3,026,598 | | 1963 | 2,932,352 | | 1962 | 2,846,082 | | 1961 | 2,765,269 | | 1960 | 2,688,229 |
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