| Year | Value | | 2014 | 3,971.7997613105 | | 2013 | 3,938.2552077282 | | 2012 | 3,899.1766422781 | | 2011 | 3,879.542093812 | | 2010 | 3,797.0922955869 | | 2009 | 3,590.8320811579 | | 2008 | 3,725.7487778801 | | 2007 | 3,661.6461038348 | | 2006 | 3,584.9621880679 | | 2005 | 3,437.3239981874 | | 2004 | 3,416.1186323834 | | 2003 | 3,324.4713917733 | | 2002 | 3,208.3921565591 | | 2001 | 3,260.0332628496 | | 2000 | 3,256.1804553948 | | 1999 | 3,171.7573836976 | | 1998 | 3,206.5917706685 | | 1997 | 3,206.2377780296 | | 1996 | 3,159.0418173811 | | 1995 | 3,060.8888747708 | | 1994 | 2,993.177532257 | | 1993 | 2,977.7121003994 | | 1992 | 2,961.3957393593 | | 1991 | 3,088.2289382371 | | 1990 | 3,272.3023106689 | | 1989 | 3,537.9238807794 | | 1988 | 3,568.5348488666 | | 1987 | 3,519.9596899706 | | 1986 | 3,384.3602429819 | | 1985 | 3,260.4261853936 | | 1984 | 3,159.8086003048 | | 1983 | 3,044.7496607223 | | 1982 | 2,900.1271056821 | | 1981 | 2,884.2082280286 | | 1980 | 3,076.4192538683 | | 1979 | 3,009.8546503686 | | 1978 | 2,988.0797126318 | | 1977 | 2,871.9149126309 | | 1976 | 2,741.2439639891 | | 1975 | 2,593.1643086962 | | 1974 | 2,413.2024030833 | | 1973 | 2,264.7284544266 | | 1972 | 2,111.7418656115 | | 1971 | 1,955.7704332972 | | 1970 | 1,806.8349849836 | | 1969 | 1,701.9014817978 | | 1968 | 1,592.7403466611 | | 1967 | 1,484.0644627507 | | 1966 | 1,361.5416180045 | | 1965 | 1,251.0116886813 | | 1964 | 1,167.0405225526 | | 1963 | 1,092.6999218547 | | 1962 | 1,062.1772770015 | | 1961 | 987.91883593646 | | 1960 | 904.56500137495 |
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