| Year | Value | | 2022 | 22,290,370 | | 2021 | 21,797,409 | | 2020 | 21,297,577 | | 2019 | 20,788,703 | | 2018 | 20,289,270 | | 2017 | 19,794,794 | | 2016 | 19,328,788 | | 2015 | 18,850,267 | | 2014 | 18,331,660 | | 2013 | 17,688,677 | | 2012 | 16,870,903 | | 2011 | 16,119,318 | | 2010 | 15,555,695 | | 2009 | 15,062,364 | | 2008 | 14,526,220 | | 2007 | 14,253,474 | | 2006 | 14,384,444 | | 2005 | 14,287,950 | | 2004 | 13,872,761 | | 2003 | 13,479,925 | | 2002 | 13,070,653 | | 2001 | 12,649,980 | | 2000 | 12,245,808 | | 1999 | 11,836,024 | | 1998 | 11,445,529 | | 1997 | 11,076,608 | | 1996 | 10,723,470 | | 1995 | 10,371,444 | | 1994 | 10,015,107 | | 1993 | 9,535,050 | | 1992 | 9,075,924 | | 1991 | 8,802,674 | | 1990 | 8,708,041 | | 1989 | 8,602,307 | | 1988 | 8,383,925 | | 1987 | 8,200,728 | | 1986 | 7,985,216 | | 1985 | 7,797,536 | | 1984 | 7,618,765 | | 1983 | 7,392,410 | | 1982 | 7,184,450 | | 1981 | 6,994,421 | | 1980 | 6,794,916 | | 1979 | 6,585,791 | | 1978 | 6,375,800 | | 1977 | 6,163,309 | | 1976 | 5,960,332 | | 1975 | 5,768,586 | | 1974 | 5,582,118 | | 1973 | 5,396,157 | | 1972 | 5,212,026 | | 1971 | 5,034,242 | | 1970 | 4,861,123 | | 1969 | 4,692,989 | | 1968 | 4,532,175 | | 1967 | 4,377,904 | | 1966 | 4,230,615 | | 1965 | 4,089,394 | | 1964 | 3,953,523 | | 1963 | 3,823,509 | | 1962 | 3,697,557 | | 1961 | 3,588,279 | | 1960 | 3,501,934 |
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