| Year | Value | | 2021 | 30,389,422 | | 2020 | 22,490,703.181 | | 2019 | 69,934,611.3 | | 2018 | 62,622,491 | | 2017 | 52,125,994 | | 2016 | 42,884,394 | | 2015 | 39,811,670 | | 2014 | 37,875,158.183182 | | 2013 | 35,246,300.748668 | | 2012 | 32,490,649.468497 | | 2011 | 34,477,031.594514 | | 2010 | 32,710,131.379004 | | 2009 | 24,733,789 | | 2008 | 25,261,998 | | 2007 | 23,721,701 | | 2006 | 20,221,059 | | 2005 | 19,040,472 | | 2004 | 16,768,232 | | 2003 | 14,065,887 | | 2002 | 11,808,082 | | 2001 | 11,445,703 | | 2000 | 11,117,833 | | 1999 | 9,991,700 | | 1998 | 9,570,400 | | 1997 | 8,745,500 | | 1996 | 8,216,500 | | 1995 | 7,324,344.1 | | 1994 | 7,385,600 | | 1993 | 6,537,200 | | 1992 | 6,010,600 | | 1991 | 4,707,300 | | 1990 | 7,188,800 | | 1989 | 7,661,800 | | 1988 | 7,416,500 | | 1987 | 7,246,800 | | 1986 | 6,920,800 | | 1985 | 6,989,200 | | 1984 | 6,658,500 | | 1983 | 5,941,300 | | 1982 | 5,223,200 | | 1981 | 6,431,500 | | 1980 | 6,945,200 | | 1979 | 7,313,900 | | 1978 | 6,626,200 | | 1977 | 6,213,400 | | 1976 | 5,839,000 | | 1975 | 5,252,700 | | 1974 | 4,862,400 | | 1973 | 4,884,800 | | 1972 | 4,411,500 | | 1971 | 3,806,500 | | 1970 | 3,799,600 |
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