| Year | Value | | 2021 | 11,363.3 | | 2020 | 11,655.55 | | 2019 | 11,740 | | 2018 | 11,740.81 | | 2017 | 11,742.81 | | 2016 | 11,817 | | 2015 | 11,743 | | 2014 | 11,742.9 | | 2013 | 11,873 | | 2012 | 12,013 | | 2011 | 12,010 | | 2010 | 12,013 | | 2009 | 12,013 | | 2008 | 11,810 | | 2007 | 11,190 | | 2006 | 11,200 | | 2005 | 10,770 | | 2004 | 11,220 | | 2003 | 11,210 | | 2002 | 11,400 | | 2001 | 11,390 | | 2000 | 11,440 | | 1999 | 11,450 | | 1998 | 11,390 | | 1997 | 11,350 | | 1996 | 11,310 | | 1995 | 11,270 | | 1994 | 11,260 | | 1993 | 11,260 | | 1992 | 11,270 | | 1991 | 11,270 | | 1990 | 11,210 | | 1989 | 11,100 | | 1988 | 11,170 | | 1987 | 11,110 | | 1986 | 11,110 | | 1985 | 11,120 | | 1984 | 11,130 | | 1983 | 11,100 | | 1982 | 11,140 | | 1981 | 11,160 | | 1980 | 11,180 | | 1979 | 11,170 | | 1978 | 11,140 | | 1977 | 11,090 | | 1976 | 10,750 | | 1975 | 10,800 | | 1974 | 11,220 | | 1973 | 11,460 | | 1972 | 11,740 | | 1971 | 12,000 | | 1970 | 12,300 | | 1969 | 12,350 | | 1968 | 12,400 | | 1967 | 12,440 | | 1966 | 12,400 | | 1965 | 12,370 | | 1964 | 12,300 | | 1963 | 12,330 | | 1962 | 12,320 | | 1961 | 12,320 |
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