Year | Value | 2021 | 5,017 | 2020 | 1,169 | 2019 | 2,336 | 2018 | 5,550 | 2017 | 5,640 | 2016 | 8,212 | 2015 | 5,499 | 2014 | 5,640 | 2013 | 5,640 | 2012 | 4,938 | 2011 | 3,036 | 2009 | 9,501 | 2008 | 9,471 | 2007 | 11,650 | 2006 | 10,925 | 2005 | 10,696 | 2004 | 10,337 | 2003 | 9,524 | 2002 | 4,720 | 2001 | 10,103 | 2000 | 5,580 | 1999 | 5,400 | 1998 | 6,600 | 1997 | 6,500 | 1996 | 3,800 | 1995 | 3,800 | 1994 | 4,200 | 1993 | 4,100 | 1992 | 4,100 | 1991 | 7,000 | 1990 | 7,100 | 1989 | 9,700 | 1988 | 6,200 | 1987 | 6,200 | 1986 | 6,100 | 1985 | 8,200 | 1984 | 8,100 | 1983 | 8,200 | 1982 | 8,500 | 1981 | 8,400 | 1980 | 8,300 | 1979 | 10,000 | 1978 | 6,500 | 1977 | 7,200 | 1975 | 3,700 | 1973 | 4,000 | 1972 | 2,300 | 1971 | 2,800 | 1970 | 3,800 |
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