| Year | Value | | 2021 | 523.761 | | 2020 | 3,563 | | 2019 | 109,095 | | 2018 | 94,245 | | 2017 | 103,560 | | 2016 | 94,919 | | 2015 | 87,082 | | 2014 | 90,335.875 | | 2013 | 371,004 | | 2012 | 100,113.3485814 | | 2011 | 78,558.861550207 | | 2010 | 73,052 | | 2009 | 101,237 | | 2008 | 108,974 | | 2007 | 110,634 | | 2006 | 105,366 | | 2005 | 101,313 | | 2004 | 93,808 | | 2003 | 75,046 | | 2002 | 84,321 | | 2001 | 78,805 | | 2000 | 82,953 | | 1999 | 76,700 | | 1998 | 64,000 | | 1997 | 280,000 | | 1996 | 254,000 | | 1995 | 254,000 | | 1994 | 241,800 | | 1993 | 241,800 | | 1992 | 235,100 | | 1991 | 222,700 | | 1990 | 222,700 | | 1989 | 220,400 | | 1988 | 217,500 | | 1987 | 205,000 | | 1986 | 200,000 | | 1985 | 202,000 | | 1984 | 197,500 | | 1983 | 196,000 | | 1982 | 185,000 | | 1981 | 184,400 | | 1980 | 192,200 | | 1979 | 184,000 | | 1978 | 166,000 | | 1977 | 165,000 | | 1971 | 166,000 | | 1970 | 165,000 |
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