Year | Value | 2021 | 5,705 | 2020 | 2,659 | 2019 | 173 | 2018 | 167.75353016688 | 2017 | 165 | 2016 | 170 | 2015 | 168 | 2014 | 5,424 | 2013 | 5,424 | 2012 | 9,670.3235106534 | 2011 | 15,455.407623056 | 2010 | 12,699 | 2009 | 19,229 | 2008 | 18,960 | 2007 | 18,909 | 2006 | 17,082 | 2005 | 16,815 | 2004 | 16,325 | 2003 | 13,953 | 2002 | 12,975 | 2001 | 13,580 | 2000 | 13,959 | 1999 | 11,200 | 1998 | 9,100 | 1997 | 10,700 | 1996 | 9,000 | 1995 | 8,900 | 1994 | 8,800 | 1993 | 8,400 | 1992 | 9,700 | 1991 | 12,900 | 1990 | 11,200 | 1989 | 9,600 | 1988 | 6,500 | 1987 | 7,300 | 1986 | 7,000 | 1985 | 5,500 | 1984 | 6,800 | 1983 | 8,200 | 1982 | 8,400 | 1981 | 8,900 | 1980 | 7,600 | 1979 | 7,900 | 1978 | 8,600 | 1977 | 8,800 | 1976 | 8,300 | 1975 | 6,800 | 1974 | 7,600 | 1973 | 4,500 | 1972 | 5,400 | 1971 | 4,300 | 1970 | 4,200 |
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