| Year | Value | | 2021 | 26,167,360 | | 2020 | 12,273,939.724 | | 2019 | 37,031,843 | | 2018 | 33,704,037 | | 2017 | 32,504,898 | | 2016 | 32,262,658 | | 2015 | 30,909,723 | | 2014 | 28,675,159 | | 2013 | 26,929,238 | | 2012 | 22,012,458.844377 | | 2011 | 18,768,534.770155 | | 2010 | 16,932,435 | | 2009 | 12,115,330 | | 2008 | 12,338,706 | | 2007 | 11,630,594 | | 2006 | 10,616,356 | | 2005 | 9,984,424 | | 2004 | 8,829,094 | | 2003 | 9,142,585 | | 2002 | 9,424,850 | | 2001 | 9,604,390 | | 2000 | 8,568,734 | | 1999 | 8,619,200 | | 1998 | 9,289,700 | | 1997 | 9,188,900 | | 1996 | 8,342,100 | | 1995 | 7,863,300 | | 1994 | 7,686,500 | | 1993 | 6,930,200 | | 1992 | 6,232,100 | | 1991 | 5,539,900 | | 1990 | 5,266,700 | | 1989 | 5,565,100 | | 1988 | 5,460,000 | | 1987 | 5,598,500 | | 1986 | 5,731,300 | | 1985 | 5,737,300 | | 1984 | 5,737,400 | | 1983 | 6,583,900 | | 1982 | 6,701,500 | | 1981 | 4,570,100 | | 1980 | 4,808,200 | | 1979 | 5,052,400 | | 1978 | 4,747,100 | | 1977 | 4,117,300 | | 1976 | 3,730,000 | | 1975 | 3,376,100 | | 1974 | 3,118,000 | | 1973 | 3,147,300 | | 1972 | 2,963,600 | | 1971 | 2,959,700 | | 1970 | 3,010,200 |
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