| Year | Value | | 2014 | -213.40051953088 | | 2013 | -205.16480924215 | | 2012 | -332.60961522235 | | 2011 | -292.20822697614 | | 2010 | -235.33713284096 | | 2009 | -258.78184075962 | | 2008 | -281.43141371334 | | 2007 | -317.88928560419 | | 2006 | -348.46401855923 | | 2005 | -440.45599306985 | | 2004 | -518.49972846948 | | 2003 | -603.50966150045 | | 2002 | -657.90060293122 | | 2001 | -813.91414402151 | | 2000 | -929.56843636294 | | 1999 | -1,077.2974283831 | | 1998 | -1,174.3341483249 | | 1997 | -1,324.8158160537 | | 1996 | -1,325.9768389864 | | 1995 | -1,373.8255453897 | | 1994 | -1,411.4264596225 | | 1993 | -1,119.4939011574 | | 1992 | -1,116.3570834276 | | 1991 | -1,205.9637690069 | | 1990 | -1,138.3751550061 | | 1989 | -778.95616464897 | | 1988 | -542.22871749359 | | 1987 | -566.72170702141 | | 1986 | -569.62757295071 | | 1985 | -593.64152243435 | | 1984 | -471.59180770965 | | 1983 | -427.11101147491 | | 1982 | -441.22647191498 | | 1981 | -441.26916800917 | | 1980 | -587.05353764111 | | 1979 | -699.22409831752 | | 1978 | -624.33696092901 | | 1977 | -771.69740749222 | | 1976 | -851.71254679468 | | 1975 | -819.78828734829 | | 1974 | -609.59709329595 | | 1973 | -499.09323011721 | | 1972 | -569.32037573593 | | 1971 | -502.85325135012 |
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