Year | Value | 2021 | 560 | 2020 | 560 | 2018 | 2,342 | 2017 | 1,669 | 2016 | 4,538 | 2015 | 5,126 | 2014 | 16,056 | 2013 | 16,932 | 2012 | 16,807.407295596 | 2011 | 20,176.728526068 | 2010 | 20,600 | 2009 | 14,652 | 2008 | 14,462 | 2007 | 14,403 | 2006 | 18,843 | 2005 | 17,306 | 2004 | 16,746 | 2003 | 14,706 | 2002 | 15,495 | 2001 | 14,973 | 2000 | 14,608 | 1999 | 7,800 | 1998 | 7,300 | 1997 | 7,000 | 1996 | 11,800 | 1995 | 4,900 | 1994 | 12,400 | 1993 | 13,100 | 1992 | 13,900 | 1991 | 11,300 | 1990 | 14,100 | 1989 | 13,800 | 1988 | 14,600 | 1987 | 13,700 | 1986 | 15,300 | 1985 | 9,900 | 1984 | 9,900 | 1983 | 9,500 | 1982 | 7,900 | 1981 | 9,300 | 1980 | 9,200 | 1979 | 7,100 | 1978 | 7,100 | 1977 | 7,000 | 1976 | 6,800 | 1975 | 3,100 | 1974 | 3,100 | 1973 | 3,000 | 1972 | 2,900 | 1971 | 2,800 | 1970 | 2,200 |
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