Year | Value | 2021 | 34,007 | 2020 | 36,664 | 2019 | 54,328 | 2018 | 41,173 | 2017 | 53,696 | 2016 | 48,892 | 2015 | 51,680 | 2014 | 34,068 | 2013 | 30,012 | 2012 | 37,309.857693979 | 2011 | 36,364.319780636 | 2010 | 32,741 | 2009 | 21,450 | 2008 | 21,751 | 2007 | 21,700 | 2006 | 21,935 | 2005 | 19,606 | 2004 | 18,712 | 2003 | 17,704 | 2002 | 31,147 | 2001 | 29,826 | 2000 | 27,512 | 1999 | 27,100 | 1998 | 29,600 | 1997 | 29,300 | 1996 | 26,800 | 1995 | 26,800 | 1994 | 57,800 | 1993 | 24,700 | 1992 | 53,200 | 1991 | 56,700 | 1990 | 62,400 | 1989 | 71,400 | 1988 | 69,500 | 1987 | 64,700 | 1986 | 57,300 | 1985 | 53,900 | 1984 | 55,400 | 1983 | 18,300 | 1982 | 19,400 | 1981 | 19,100 | 1980 | 19,200 | 1979 | 20,300 | 1978 | 20,400 | 1977 | 18,100 | 1976 | 18,900 | 1975 | 18,800 |
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