Year | Value | 2021 | 60,991.397 | 2020 | 60,453.877 | 2019 | 59,506.358 | 2018 | 58,558.838 | 2017 | 57,841.319 | 2016 | 57,003.8 | 2015 | 56,476.28 | 2014 | 56,018.761 | 2013 | 55,721.242 | 2012 | 55,323.722 | 2011 | 54,506.938 | 2010 | 54,030 | 2009 | 53,550 | 2008 | 53,550 | 2007 | 53,550 | 2006 | 53,550 | 2005 | 53,560 | 2004 | 52,300 | 2003 | 51,000 | 2002 | 50,000 | 2001 | 48,900 | 2000 | 47,700 | 1999 | 46,400 | 1998 | 46,300 | 1997 | 45,800 | 1996 | 45,800 | 1995 | 45,700 | 1994 | 45,700 | 1993 | 45,310 | 1992 | 45,150 | 1991 | 45,100 | 1990 | 44,550 | 1989 | 44,350 | 1988 | 41,500 | 1987 | 37,000 | 1986 | 32,900 | 1985 | 29,900 | 1984 | 26,910 | 1983 | 26,900 | 1982 | 26,800 | 1981 | 26,500 | 1980 | 26,500 | 1979 | 26,000 | 1978 | 26,000 | 1977 | 25,500 | 1976 | 25,500 | 1975 | 25,000 | 1974 | 25,000 | 1973 | 24,500 | 1972 | 24,500 | 1971 | 24,500 | 1970 | 34,190 | 1969 | 34,770 | 1968 | 35,770 | 1967 | 36,290 | 1966 | 36,270 | 1965 | 36,270 | 1964 | 35,950 | 1963 | 35,420 | 1962 | 35,330 | 1961 | 35,180 |
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