Year | Value | 2021 | 11,210 | 2020 | 10,045 | 2019 | 33,050 | 2018 | 34,425 | 2017 | 41,012 | 2016 | 40,711 | 2015 | 37,598 | 2014 | 37,517 | 2013 | 32,636.4 | 2012 | 31,373 | 2011 | 26,052 | 2010 | 20,921 | 2009 | 16,632 | 2008 | 20,512 | 2007 | 21,020 | 2006 | 20,979 | 2005 | 19,712 | 2004 | 18,699 | 2003 | 12,603 | 2002 | 10,480 | 2001 | 11,386 | 2000 | 5,206 | 1999 | 10,100 | 1998 | 9,300 | 1997 | 8,800 | 1996 | 8,800 | 1995 | 8,900 | 1994 | 8,900 | 1993 | 8,900 | 1992 | 9,100 | 1991 | 8,200 | 1990 | 7,900 | 1989 | 6,900 | 1988 | 6,100 | 1987 | 5,800 | 1986 | 5,800 | 1985 | 6,700 | 1984 | 5,900 | 1983 | 5,400 | 1982 | 3,500 | 1981 | 4,100 | 1980 | 3,800 | 1979 | 1,700 | 1978 | 3,100 | 1977 | 5,300 | 1976 | 4,000 | 1975 | 4,400 | 1974 | 4,200 | 1973 | 2,900 | 1972 | 4,400 | 1971 | 5,200 | 1970 | 4,400 |
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