| Year | Value | | 2014 | 5,858.8015362875 | | 2013 | 6,039.4320002451 | | 2012 | 6,038.5523069362 | | 2011 | 6,165.9736199442 | | 2010 | 6,327.506456299 | | 2009 | 6,219.7010915076 | | 2008 | 6,534.1238501892 | | 2007 | 6,668.3902664463 | | 2006 | 6,824.7459387722 | | 2005 | 6,659.000426613 | | 2004 | 6,615.5699587179 | | 2003 | 6,602.636379725 | | 2002 | 6,533.7520143023 | | 2001 | 6,490.0929931292 | | 2000 | 6,482.4886283958 | | 1999 | 6,508.5133805317 | | 1998 | 6,504.2563287828 | | 1997 | 6,607.2014124527 | | 1996 | 6,646.685948174 | | 1995 | 6,424.5372917237 | | 1994 | 6,539.5357056421 | | 1993 | 6,306.8695616645 | | 1992 | 6,236.2584769607 | | 1991 | 6,217.3355130029 | | 1990 | 5,944.8283669579 | | 1989 | 5,853.9600054086 | | 1988 | 5,858.0575633257 | | 1987 | 5,794.3945649562 | | 1986 | 5,618.5546273104 | | 1985 | 5,351.1250484239 | | 1984 | 4,979.6356105571 | | 1983 | 4,739.6543454555 | | 1982 | 4,678.9544746679 | | 1981 | 4,589.9969774905 | | 1980 | 4,599.2340075506 | | 1979 | 4,541.900300598 | | 1978 | 4,314.4455363454 | | 1977 | 3,999.6706246086 | | 1976 | 3,793.7182460421 | | 1975 | 3,414.5200007431 | | 1974 | 3,245.9932487622 | | 1973 | 3,428.2111751002 | | 1972 | 3,346.8253440383 | | 1971 | 3,059.3621842363 | | 1970 | 2,893.2243971452 | | 1969 | 2,620.4756472998 | | 1968 | 2,339.2135021541 | | 1967 | 2,128.4894549603 | | 1966 | 1,984.4160803572 | | 1965 | 1,818.6547964157 | | 1964 | 1,624.4987369951 | | 1963 | 1,497.9241038979 | | 1962 | 1,355.931619908 | | 1961 | 1,192.4052955025 | | 1960 | 1,089.6140997375 |
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