| Year | Value | | 2014 | 4,539.4993259429 | | 2013 | 4,420.4696582261 | | 2012 | 4,251.9588194447 | | 2011 | 4,027.6680482507 | | 2010 | 4,071.9442632846 | | 2009 | 3,874.728339491 | | 2008 | 3,235.2169742545 | | 2007 | 3,227.9289211181 | | 2006 | 3,030.0180543417 | | 2005 | 2,847.9139574169 | | 2004 | 2,967.5627447204 | | 2003 | 2,909.8914278921 | | 2002 | 2,828.2553817561 | | 2001 | 2,777.8678040245 | | 2000 | 2,776.8831321652 | | 1999 | 2,682.7719413617 | | 1998 | 2,560.5507648549 | | 1997 | 2,508.3793829578 | | 1996 | 2,222.6249043516 | | 1995 | 2,039.4909084264 | | 1994 | 1,820.5391137943 | | 1993 | 1,568.7075700534 | | 1992 | 1,455.6282745969 | | 1991 | 1,301.5705206904 | | 1990 | 1,191.2391204594 | | 1989 | 1,108.3338136466 | | 1988 | 1,027.1948225605 | | 1987 | 952.34216358493 | | 1986 | 911.57767274214 | | 1985 | 870.12725263575 | | 1984 | 844.31544878022 | | 1983 | 796.48148845207 | | 1982 | 757.41527440249 | | 1981 | 717.7509330541 | | 1980 | 687.81791242799 | | 1979 | 646.36837980177 | | 1978 | 586.42086523066 | | 1977 | 555.69541147813 | | 1976 | 488.57770152865 | | 1975 | 450.07951921282 | | 1974 | 419.22554960937 | | 1973 | 392.94332721305 | | 1972 | 364.11208356821 | | 1971 | 328.26167155505 |
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