| Year | Value | | 2014 | 6,712.774758245 | | 2013 | 6,833.9114347929 | | 2012 | 6,876.5897529341 | | 2011 | 7,060.0537684072 | | 2010 | 7,006.2738205305 | | 2009 | 6,856.2818973154 | | 2008 | 7,173.0462987866 | | 2007 | 7,157.3785766748 | | 2006 | 7,025.8344788155 | | 2005 | 6,912.3720853625 | | 2004 | 6,882.9702208831 | | 2003 | 6,695.7151244396 | | 2002 | 6,641.7407618796 | | 2001 | 6,599.2653703249 | | 2000 | 6,507.1059249394 | | 1999 | 6,349.3195838526 | | 1998 | 6,257.8908830971 | | 1997 | 6,066.2432377896 | | 1996 | 5,905.9921967731 | | 1995 | 5,719.0611091036 | | 1994 | 5,643.1069481457 | | 1993 | 5,494.1123719194 | | 1992 | 5,441.6554718909 | | 1991 | 5,327.4768513818 | | 1990 | 5,218.2020411316 | | 1989 | 5,052.6277792702 | | 1988 | 4,924.1556320712 | | 1987 | 4,722.933873266 | | 1986 | 4,566.6847695329 | | 1985 | 4,517.0895865973 | | 1984 | 4,412.1650744016 | | 1983 | 4,300.2505034081 | | 1982 | 4,237.7778041724 | | 1981 | 4,292.7007172212 | | 1980 | 4,364.1606241784 | | 1979 | 4,403.1066506058 | | 1978 | 4,251.1314975936 | | 1977 | 4,077.4571067 | | 1976 | 4,009.7903033076 | | 1975 | 3,773.1403481621 | | 1974 | 3,735.2374179922 | | 1973 | 3,612.3102043392 | | 1972 | 3,414.6890073093 | | 1971 | 3,146.4632566137 | | 1970 | 2,948.33940585 | | 1969 | 2,710.9056821316 | | 1968 | 2,487.2501133371 | | 1967 | 2,243.6536772195 | | 1966 | 2,088.1884926693 | | 1965 | 1,914.153151122 | | 1964 | 1,778.7405418599 | | 1963 | 1,647.5059347486 | | 1962 | 1,528.5003696099 | | 1961 | 1,421.0335301707 | | 1960 | 1,353.399443231 |
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