| Year | Value | | 2022 | 22,205,751 | | 2021 | 21,736,184 | | 2020 | 21,259,406 | | 2019 | 20,774,818 | | 2018 | 20,301,429 | | 2017 | 19,826,367 | | 2016 | 19,369,155 | | 2015 | 18,907,546 | | 2014 | 18,414,828 | | 2013 | 17,793,123 | | 2012 | 16,993,544 | | 2011 | 16,258,743 | | 2010 | 15,709,180 | | 2009 | 15,226,676 | | 2008 | 14,692,161 | | 2007 | 14,407,413 | | 2006 | 14,521,163 | | 2005 | 14,410,735 | | 2004 | 13,986,188 | | 2003 | 13,588,897 | | 2002 | 13,184,691 | | 2001 | 12,775,683 | | 2000 | 12,383,050 | | 1999 | 11,984,710 | | 1998 | 11,607,960 | | 1997 | 11,254,162 | | 1996 | 10,915,862 | | 1995 | 10,577,414 | | 1994 | 10,232,966 | | 1993 | 9,760,768 | | 1992 | 9,309,748 | | 1991 | 9,043,704 | | 1990 | 8,950,340 | | 1989 | 8,840,284 | | 1988 | 8,603,421 | | 1987 | 8,397,291 | | 1986 | 8,163,006 | | 1985 | 7,956,320 | | 1984 | 7,758,267 | | 1983 | 7,511,326 | | 1982 | 7,283,232 | | 1981 | 7,072,839 | | 1980 | 6,858,453 | | 1979 | 6,648,039 | | 1978 | 6,443,907 | | 1977 | 6,236,881 | | 1976 | 6,039,010 | | 1975 | 5,849,037 | | 1974 | 5,661,027 | | 1973 | 5,475,982 | | 1972 | 5,295,288 | | 1971 | 5,120,686 | | 1970 | 4,950,225 | | 1969 | 4,783,747 | | 1968 | 4,623,958 | | 1967 | 4,470,599 | | 1966 | 4,323,269 | | 1965 | 4,181,151 | | 1964 | 4,044,133 | | 1963 | 3,912,316 | | 1962 | 3,784,275 | | 1961 | 3,672,435 | | 1960 | 3,582,744 |
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