| Year | Value | | 2021 | 6,886,922 | | 2020 | 10,613,531 | | 2019 | 47,776,892 | | 2018 | 43,080,118 | | 2017 | 39,341,995 | | 2016 | 40,206,684 | | 2015 | 37,023,422 | | 2014 | 34,897,404 | | 2013 | 25,540,880 | | 2012 | 28,540,727.36081 | | 2011 | 26,326,620.762832 | | 2010 | 22,575,356 | | 2009 | 10,480,898 | | 2008 | 9,508,389 | | 2007 | 8,818,150 | | 2006 | 8,304,634 | | 2005 | 8,056,829 | | 2004 | 7,387,965 | | 2003 | 6,457,529 | | 2002 | 6,449,022 | | 2001 | 6,416,383 | | 2000 | 5,756,288 | | 1999 | 5,024,000 | | 1998 | 6,731,600 | | 1997 | 7,474,600 | | 1996 | 7,263,100 | | 1995 | 7,179,600 | | 1994 | 6,851,500 | | 1993 | 6,526,200 | | 1992 | 6,136,500 | | 1991 | 5,438,100 | | 1990 | 5,638,700 | | 1989 | 5,715,200 | | 1988 | 5,719,500 | | 1987 | 5,247,300 | | 1986 | 4,879,600 | | 1985 | 4,610,400 | | 1984 | 4,394,000 | | 1983 | 4,319,800 | | 1982 | 3,866,900 | | 1981 | 3,542,700 | | 1980 | 3,245,600 | | 1979 | 3,474,900 | | 1978 | 3,411,600 | | 1977 | 3,021,100 | | 1976 | 2,815,700 | | 1975 | 2,758,400 | | 1974 | 2,525,100 | | 1973 | 2,349,600 | | 1972 | 2,123,900 | | 1971 | 2,070,900 | | 1970 | 2,369,000 |
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