| Year | Value | | 2014 | 1,408.0911033981 | | 2013 | 1,382.0891581132 | | 2012 | 1,367.5922867509 | | 2011 | 1,288.190702983 | | 2010 | 1,332.4383713981 | | 2009 | 1,243.5435139159 | | 2008 | 1,159.3220465939 | | 2007 | 1,121.0356513155 | | 2006 | 1,077.7829435388 | | 2005 | 1,054.1622418357 | | 2004 | 1,007.4595143421 | | 2003 | 969.31487165039 | | 2002 | 1,042.5416221666 | | 2001 | 1,014.4947690989 | | 2000 | 958.2227030856 | | 1999 | 915.29818911129 | | 1998 | 837.33347883075 | | 1997 | 796.50987848019 | | 1996 | 757.53800149514 | | 1995 | 746.81771299691 | | 1994 | 736.83649852934 | | 1993 | 684.95950785398 | | 1992 | 662.99045502775 | | 1991 | 628.67823445442 | | 1990 | 616.8229636341 | | 1989 | 589.2401478805 | | 1988 | 570.84161834466 | | 1987 | 540.61934632428 | | 1986 | 518.14220808315 | | 1985 | 496.38233451381 | | 1984 | 451.97541418601 | | 1983 | 438.70844009606 | | 1982 | 399.42368455189 | | 1981 | 410.58414454223 | | 1980 | 390.23094009932 | | 1979 | 343.03841640625 | | 1978 | 293.05137304081 | | 1977 | 265.39657091874 | | 1976 | 233.38962340291 | | 1975 | 210.60572285951 | | 1974 | 202.3831326486 | | 1973 | 189.61683123919 | | 1972 | 174.05530823579 | | 1971 | 154.95827897893 |
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