Year | Value | 2021 | 5,791 | 2020 | 10,450 | 2019 | 25,859 | 2018 | 24,134 | 2017 | 21,855 | 2016 | 20,906 | 2015 | 19,487 | 2014 | 19,140 | 2013 | 11,748 | 2012 | 16,011.285812436 | 2011 | 18,142 | 2010 | 26,127 | 2009 | 45,595 | 2008 | 46,467 | 2007 | 46,359 | 2006 | 46,866 | 2005 | 41,886 | 2004 | 36,920 | 2003 | 38,732 | 2002 | 37,685 | 2001 | 62,768 | 2000 | 57,776 | 1999 | 57,300 | 1998 | 87,900 | 1997 | 86,900 | 1996 | 33,600 | 1995 | 32,600 | 1994 | 31,000 | 1993 | 27,000 | 1992 | 27,200 | 1991 | 23,200 | 1990 | 23,500 | 1989 | 23,600 | 1988 | 23,700 | 1987 | 13,100 | 1986 | 14,200 | 1985 | 15,800 | 1984 | 15,700 | 1983 | 15,500 | 1982 | 15,500 | 1981 | 19,200 | 1980 | 21,200 | 1979 | 15,200 | 1978 | 13,200 | 1977 | 12,800 | 1976 | 17,600 | 1975 | 17,800 | 1974 | 17,600 | 1973 | 15,500 |
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