| Year | Value | | 2014 | -496.5979012318 | | 2013 | -464.5587206195 | | 2012 | -539.72592247249 | | 2011 | -672.11268829417 | | 2010 | -944.89281842285 | | 2009 | -901.14324540087 | | 2008 | -889.66090154292 | | 2007 | -897.75553872944 | | 2006 | -1,000.9569556755 | | 2005 | -1,154.6069956992 | | 2004 | -1,145.3850656759 | | 2003 | -1,169.7517395358 | | 2002 | -1,528.398497929 | | 2001 | -1,596.4080246712 | | 2000 | -1,938.6618996101 | | 1999 | -1,942.0030382552 | | 1998 | -1,780.8275863968 | | 1997 | -1,617.7743535603 | | 1996 | -1,377.2854785805 | | 1995 | -1,149.1164053188 | | 1994 | -1,291.6208212305 | | 1993 | -1,162.6535262702 | | 1992 | -1,056.169903074 | | 1991 | -968.44841722645 | | 1990 | -1,010.9236887598 | | 1989 | -1,021.6661769141 | | 1988 | -933.4503445829 | | 1987 | -807.5665996539 | | 1986 | -770.98367694739 | | 1985 | -739.02375218929 | | 1984 | -790.57286191288 | | 1983 | -673.46791399102 | | 1982 | -658.09719079314 | | 1981 | -619.53716964446 | | 1980 | -516.12474869872 | | 1979 | -439.95426462328 | | 1978 | -380.23356415832 | | 1977 | -289.93655370555 | | 1976 | -314.25505961273 | | 1975 | -300.95616261997 | | 1974 | -426.4688821819 | | 1973 | -358.01897243889 | | 1972 | -27.555398611807 | | 1971 | 34.223826004877 |
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