| Year | Value | | 2014 | -540.99747122965 | | 2013 | -594.54614286736 | | 2012 | -589.50613135701 | | 2011 | -619.05389459128 | | 2010 | -703.77238144353 | | 2009 | -764.54942148287 | | 2008 | -885.24594080377 | | 2007 | -858.18881530337 | | 2006 | -759.62878882364 | | 2005 | -735.8642947036 | | 2004 | -555.8095354099 | | 2003 | -501.43665594339 | | 2002 | -550.71418530133 | | 2001 | -475.11125528035 | | 2000 | -504.15900175724 | | 1999 | -519.35240594873 | | 1998 | -542.37070811442 | | 1997 | -520.23216470175 | | 1996 | -507.33401838066 | | 1995 | -472.40650784965 | | 1994 | -418.09319254097 | | 1993 | -386.72435328105 | | 1992 | -440.71854468569 | | 1991 | -397.26603786395 | | 1990 | -387.0180222996 | | 1989 | -394.39523276476 | | 1988 | -403.08925252938 | | 1987 | -331.78355004649 | | 1986 | -263.26977088714 | | 1985 | -215.48705746369 | | 1984 | -203.69559765004 | | 1983 | -177.16271231136 | | 1982 | -129.53693493579 | | 1981 | -124.34030811421 | | 1980 | -147.6534919463 | | 1979 | -145.52095759177 | | 1978 | -130.49093969198 | | 1977 | -166.83001668701 | | 1976 | -173.9743905176 | | 1975 | -176.52549895484 | | 1974 | -187.07536691479 | | 1973 | -182.7572791748 | | 1972 | -153.69330852642 | | 1971 | -136.78991717973 |
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