| Year | Value | | 2014 | 10,071.398978501 | | 2013 | 10,220.887301346 | | 2012 | 10,407.740307076 | | 2011 | 10,627.293865038 | | 2010 | 10,726.92818319 | | 2009 | 10,791.616480312 | | 2008 | 10,749.11106061 | | 2007 | 10,972.880149256 | | 2006 | 10,617.151287621 | | 2005 | 10,571.425342834 | | 2004 | 10,657.902116931 | | 2003 | 10,527.294187839 | | 2002 | 10,899.754349915 | | 2001 | 10,712.695361656 | | 2000 | 10,260.446243542 | | 1999 | 10,097.136633847 | | 1998 | 9,837.8166665807 | | 1997 | 9,338.4711760607 | | 1996 | 9,151.3927173939 | | 1995 | 9,027.8847703639 | | 1994 | 8,837.0044527894 | | 1993 | 8,717.6452388934 | | 1992 | 8,558.3342177464 | | 1991 | 8,522.1414720497 | | 1990 | 8,527.2140941457 | | 1989 | 8,129.0958900981 | | 1988 | 7,800.5517003098 | | 1987 | 7,525.6977519624 | | 1986 | 7,309.1173560323 | | 1985 | 6,994.1612504237 | | 1984 | 6,684.3434380715 | | 1983 | 6,356.0059744806 | | 1982 | 6,388.6605638067 | | 1981 | 6,154.888409101 | | 1980 | 5,915.2600054451 | | 1979 | 5,665.9776767259 | | 1978 | 5,416.2836049589 | | 1977 | 5,251.1978579481 | | 1976 | 4,901.5891113803 | | 1975 | 4,781.6166414741 | | 1974 | 4,578.882168622 | | 1973 | 4,230.3437967115 | | 1972 | 3,880.9288912499 | | 1971 | 3,751.6425755585 | | 1970 | 3,609.9784120892 | | 1969 | 3,329.6093941124 | | 1968 | 3,102.0068282122 | | 1967 | 2,969.4889397407 | | 1966 | 2,765.0845420994 | | 1965 | 2,625.2195293291 | | 1964 | 2,417.2114265246 | | 1963 | 2,211.6894977169 | | 1962 | 2,012.6605846211 | | 1961 | 1,947.1525326719 | | 1960 | 1,825.6256497241 |
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