Year | Value | 2021 | 2,758 | 2020 | 6,537 | 2019 | 16,359 | 2018 | 16,299 | 2017 | 9,731 | 2016 | 9,986 | 2015 | 9,772 | 2014 | 12,732 | 2013 | 16,944 | 2012 | 15,836.128631119 | 2011 | 12,262 | 2010 | 11,374 | 2009 | 9,793 | 2008 | 10,007 | 2007 | 9,957 | 2006 | 9,959 | 2005 | 9,002 | 2004 | 8,413 | 2003 | 7,068 | 2002 | 6,971 | 2001 | 6,652 | 2000 | 6,411 | 1999 | 6,300 | 1998 | 3,900 | 1997 | 3,900 | 1996 | 3,900 | 1995 | 3,900 | 1994 | 3,700 | 1993 | 3,700 | 1992 | 3,700 | 1991 | 3,400 | 1990 | 3,400 | 1989 | 2,100 | 1988 | 2,000 | 1987 | 2,000 | 1986 | 1,500 | 1985 | 500 | 1984 | 500 | 1983 | 400 | 1982 | 400 | 1981 | 400 | 1980 | 400 | 1979 | 400 | 1978 | 400 | 1977 | 1,800 | 1976 | 2,400 | 1975 | 2,400 | 1974 | 2,400 | 1973 | 2,500 | 1972 | 2,400 | 1971 | 2,300 | 1970 | 3,100 |
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