| Year | Value | | 2014 | 6,083.2699356802 | | 2013 | 5,941.1609020881 | | 2012 | 6,031.2443182613 | | 2011 | 5,959.895921715 | | 2010 | 5,973.3492782096 | | 2009 | 5,950.837540156 | | 2008 | 5,883.0377418149 | | 2007 | 5,907.3493052644 | | 2006 | 5,882.8076008808 | | 2005 | 5,878.4418481771 | | 2004 | 5,782.5606250461 | | 2003 | 5,713.8824508231 | | 2002 | 5,647.8996456162 | | 2001 | 5,549.9456384135 | | 2000 | 5,446.6616654163 | | 1999 | 5,268.1450087036 | | 1998 | 5,325.7331479133 | | 1997 | 4,968.4865856102 | | 1996 | 4,915.7019656592 | | 1995 | 4,849.8237520508 | | 1994 | 4,835.4707227359 | | 1993 | 4,698.6951364176 | | 1992 | 4,507.887251099 | | 1991 | 4,401.2517385257 | | 1990 | 4,177.9297046192 | | 1989 | 3,936.7239984524 | | 1988 | 4,072.0733527614 | | 1987 | 3,845.3543589284 | | 1986 | 3,196.7925279658 | | 1985 | 2,918.3314394634 | | 1984 | 2,786.453991367 | | 1983 | 2,624.8339600756 | | 1982 | 2,361.4778231551 | | 1981 | 2,229.6176254968 | | 1980 | 2,156.5839110426 | | 1979 | 2,003.1644927683 | | 1978 | 1,950.7230851634 | | 1977 | 1,804.8737919148 | | 1976 | 1,610.0044267375 | | 1975 | 1,439.3939393939 | | 1974 | 1,351.3636986614 | | 1973 | 1,416.4466239155 | | 1972 | 1,311.9604229314 | | 1971 | 1,297.8023879564 |
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