Year | Value | 2021 | 74,453.146 | 2020 | 51,519.349 | 2019 | 68,734 | 2018 | 75,594.726523888 | 2017 | 53,696 | 2016 | 53,971 | 2015 | 61,474 | 2014 | 61,512.452949339 | 2013 | 59,182 | 2012 | 65,631.507073707 | 2011 | 68,014.276344977 | 2010 | 61,789 | 2009 | 16,851 | 2008 | 18,005 | 2007 | 16,936 | 2006 | 16,045 | 2005 | 10,227 | 2004 | 8,254 | 2003 | 8,987 | 2002 | 13,154 | 2001 | 10,667 | 2000 | 12,761 | 1999 | 8,400 | 1998 | 7,500 | 1997 | 6,400 | 1996 | 5,600 | 1995 | 6,600 | 1994 | 11,200 | 1993 | 11,900 | 1992 | 12,500 | 1991 | 14,900 | 1990 | 17,400 | 1989 | 15,900 | 1988 | 19,700 | 1987 | 30,100 | 1986 | 32,600 | 1985 | 37,500 | 1984 | 27,700 | 1983 | 28,600 | 1982 | 26,700 | 1981 | 37,800 | 1980 | 39,100 | 1979 | 35,400 | 1978 | 33,500 | 1977 | 30,800 | 1976 | 24,900 | 1975 | 19,200 | 1974 | 17,200 | 1973 | 16,900 | 1972 | 14,500 | 1971 | 11,700 | 1970 | 9,400 |
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