Year | Value | 2021 | 15,413 | 2020 | 2,261 | 2019 | 3,116 | 2018 | 3,178 | 2017 | 5,831 | 2016 | 3,165 | 2015 | 6,021 | 2014 | 6,852 | 2013 | 9,432 | 2012 | 13,525.496329162 | 2011 | 16,727.088236529 | 2010 | 10,897 | 2009 | 7,178 | 2008 | 7,219 | 2007 | 9,418 | 2006 | 8,839 | 2005 | 8,695 | 2004 | 8,435 | 2003 | 7,849 | 2002 | 7,523 | 2001 | 7,562 | 2000 | 7,753 | 1999 | 7,500 | 1998 | 4,400 | 1997 | 5,500 | 1996 | 9,800 | 1995 | 9,300 | 1994 | 10,600 | 1993 | 10,000 | 1992 | 8,400 | 1991 | 6,800 | 1990 | 9,100 | 1989 | 8,000 | 1988 | 5,500 | 1987 | 6,400 | 1986 | 5,100 | 1985 | 7,900 | 1984 | 9,200 | 1983 | 9,000 | 1982 | 7,800 | 1981 | 7,800 | 1980 | 10,400 | 1979 | 10,600 | 1978 | 10,500 | 1977 | 10,300 | 1976 | 9,800 | 1975 | 9,200 | 1974 | 9,200 | 1973 | 9,100 | 1972 | 9,100 | 1971 | 9,500 | 1970 | 9,300 |
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