| Year | Value | | 2014 | 3,661.1300090943 | | 2013 | 3,567.2215416469 | | 2012 | 3,381.7845649841 | | 2011 | 3,268.7667672929 | | 2010 | 3,071.4015244645 | | 2009 | 2,791.0998532859 | | 2008 | 2,696.3000900726 | | 2007 | 2,642.5712493515 | | 2006 | 2,431.9363786032 | | 2005 | 2,258.8022377608 | | 2004 | 2,112.3132045868 | | 2003 | 1,947.1187207063 | | 2002 | 1,824.6984381027 | | 2001 | 1,726.0427967135 | | 2000 | 1,664.0282459594 | | 1999 | 1,564.8988500222 | | 1998 | 1,512.8531200908 | | 1997 | 1,499.1804975263 | | 1996 | 1,449.9691943464 | | 1995 | 1,387.9110126815 | | 1994 | 1,335.0393956468 | | 1993 | 1,243.8584155297 | | 1992 | 1,188.8484579131 | | 1991 | 1,143.892445917 | | 1990 | 1,096.981416651 | | 1989 | 1,027.5592545758 | | 1988 | 975.38793644881 | | 1987 | 919.88118297555 | | 1986 | 863.22686286424 | | 1985 | 836.0461035286 | | 1984 | 801.11823883146 | | 1983 | 764.79588382773 | | 1982 | 727.24372673424 | | 1981 | 719.25828341475 | | 1980 | 712.69925517212 | | 1979 | 709.11482841968 | | 1978 | 674.07591145863 | | 1977 | 632.37891449837 | | 1976 | 603.48610788376 | | 1975 | 573.48755677201 | | 1974 | 546.38200502512 | | 1973 | 551.99904900807 | | 1972 | 510.53302380563 | | 1971 | 472.20450625196 |
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