| Year | Value | | 2014 | -114.71213819646 | | 2013 | -118.75887989885 | | 2012 | -125.6575114677 | | 2011 | -117.98283613741 | | 2010 | -123.06956245786 | | 2009 | -125.64908518633 | | 2008 | -178.77383342094 | | 2007 | -156.97492768653 | | 2006 | -199.58702724119 | | 2005 | -194.88857909931 | | 2004 | -209.63588523313 | | 2003 | -153.69703321231 | | 2002 | -141.49947450371 | | 2001 | -142.46745085279 | | 2000 | -154.29191683995 | | 1999 | -165.22241916735 | | 1998 | -139.06222629881 | | 1997 | -152.22433622221 | | 1996 | -160.96518004558 | | 1995 | -177.91200897103 | | 1994 | -215.8156708137 | | 1993 | -208.55395828819 | | 1992 | -168.69407665712 | | 1991 | -158.55553855463 | | 1990 | -159.06296149085 | | 1989 | -177.24686809138 | | 1988 | -182.45763593721 | | 1987 | -81.776018148938 | | 1986 | -190.98287641407 | | 1985 | -181.6865782185 | | 1984 | -166.22045188586 | | 1983 | -161.12608025039 | | 1982 | -111.79491230701 | | 1981 | -130.56275563599 | | 1980 | -134.37889478596 | | 1979 | -160.44019345892 | | 1978 | -167.11823513529 | | 1977 | -154.12296505056 | | 1976 | -206.85509184626 | | 1975 | -197.42514144838 | | 1974 | -256.16741719214 | | 1973 | -403.96305929707 | | 1972 | -124.88430659012 | | 1971 | 40.805801888037 |
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