Year | Value | 2014 | 2,070.8224891374 | 2013 | 2,025.8763707767 | 2012 | 1,963.5874767169 | 2011 | 1,833.4501774893 | 2010 | 1,754.3244774489 | 2009 | 1,648.6188602784 | 2008 | 1,636.4945143102 | 2007 | 1,582.0543918984 | 2006 | 1,488.1672447057 | 2005 | 1,465.8782504323 | 2004 | 1,435.5700085499 | 2003 | 1,371.319156854 | 2002 | 1,336.1145021291 | 2001 | 1,301.1985531639 | 2000 | 1,278.5955836815 | 1999 | 1,231.0065508712 | 1998 | 1,191.9546010522 | 1997 | 1,184.2324872206 | 1996 | 1,094.3113848072 | 1995 | 1,072.1385002653 | 1994 | 1,020.8970141486 | 1993 | 966.82683291537 | 1992 | 918.03027111842 | 1991 | 885.27619818037 | 1990 | 840.41914016836 | 1989 | 838.42845737085 | 1988 | 877.83523530968 | 1987 | 972.03981663141 | 1986 | 926.58525296401 | 1985 | 901.65743844629 | 1984 | 867.489268138 | 1983 | 913.98661614802 | 1982 | 846.23950187465 | 1981 | 796.76819636841 | 1980 | 781.81408461068 | 1979 | 804.47156470242 | 1978 | 702.0783339483 | 1977 | 720.73218491552 | 1976 | 680.70534789327 | 1975 | 638.66235973061 | 1974 | 620.46187442183 | 1973 | 632.82682894241 | 1972 | 572.80272748941 | 1971 | 526.59530797808 |
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