Year | Value | 2021 | 36,260.96 | 2020 | 27,903.88 | 2019 | 49,749 | 2018 | 48,542 | 2017 | 51,019 | 2016 | 70,005 | 2015 | 65,749 | 2014 | 57,956 | 2013 | 61,820 | 2012 | 72,232 | 2011 | 72,695 | 2010 | 64,932 | 2009 | 50,939 | 2008 | 52,165 | 2007 | 51,029 | 2006 | 51,296 | 2005 | 48,905 | 2004 | 50,309 | 2003 | 44,731 | 2002 | 41,917 | 2001 | 52,616 | 2000 | 63,956 | 1999 | 74,400 | 1998 | 68,600 | 1997 | 73,300 | 1996 | 70,000 | 1995 | 69,400 | 1994 | 69,200 | 1993 | 70,300 | 1992 | 69,700 | 1991 | 65,700 | 1990 | 66,100 | 1989 | 62,500 | 1988 | 60,700 | 1987 | 53,800 | 1986 | 52,000 | 1985 | 48,200 | 1984 | 45,100 | 1983 | 43,800 | 1982 | 41,200 | 1981 | 40,600 | 1980 | 45,300 | 1979 | 45,000 | 1978 | 43,100 | 1977 | 39,900 | 1976 | 37,300 | 1975 | 32,000 | 1974 | 26,700 | 1973 | 24,300 | 1972 | 23,600 | 1971 | 34,000 | 1970 | 44,300 |
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