Year | Value | 2021 | 9,046.238 | 2020 | 6,032.238 | 2019 | 11,339 | 2018 | 12,340 | 2017 | 9,686 | 2016 | 10,764 | 2015 | 13,298 | 2014 | 26,414 | 2013 | 32,064 | 2012 | 16,514.431577206 | 2011 | 27,770.502063366 | 2010 | 34,878.077173779 | 2009 | 9,812 | 2008 | 9,930 | 2007 | 13,477 | 2006 | 12,657 | 2005 | 13,335 | 2004 | 8,042 | 2003 | 6,414 | 2002 | 5,884 | 2001 | 5,884 | 2000 | 6,194 | 1999 | 6,100 | 1998 | 6,000 | 1997 | 6,000 | 1996 | 6,100 | 1995 | 5,800 | 1994 | 7,100 | 1993 | 9,100 | 1992 | 14,400 | 1991 | 19,000 | 1990 | 18,200 | 1989 | 17,000 | 1988 | 16,400 | 1987 | 14,400 | 1986 | 15,400 | 1985 | 16,600 | 1984 | 16,700 | 1983 | 16,500 | 1982 | 14,900 | 1981 | 13,400 | 1980 | 12,200 | 1979 | 11,600 | 1978 | 11,100 | 1977 | 11,100 | 1976 | 9,800 | 1975 | 9,500 | 1974 | 8,800 | 1973 | 8,400 | 1972 | 7,400 | 1971 | 6,600 | 1970 | 6,200 |
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