| Year | Value | | 2014 | -229.39049104602 | | 2013 | -218.56959667392 | | 2012 | -240.16109913788 | | 2011 | -244.64882561357 | | 2010 | -232.18127710691 | | 2009 | -275.05695360314 | | 2008 | -329.71755705723 | | 2007 | -317.81384908554 | | 2006 | -310.00936456716 | | 2005 | -270.16295120317 | | 2004 | -300.63849262196 | | 2003 | -216.80782082349 | | 2002 | -316.68510697267 | | 2001 | -359.75997367064 | | 2000 | -419.6401097844 | | 1999 | -496.43616630858 | | 1998 | -293.80239401377 | | 1997 | -99.247744550882 | | 1996 | -23.364260038663 | | 1995 | -19.638803869822 | | 1994 | -18.445116282954 | | 1993 | -18.04161199076 | | 1992 | -21.610035564651 | | 1991 | -22.113887031504 | | 1990 | -450.5167718544 | | 1989 | -598.44227569433 | | 1988 | -646.09655265804 | | 1987 | -590.67801061766 | | 1986 | -446.89840116802 | | 1985 | -395.10660752311 | | 1984 | -380.1953092014 | | 1983 | -312.68915835387 | | 1982 | -410.19087535936 | | 1981 | -375.24335399119 | | 1980 | -1,293.4773558138 | | 1979 | -1,572.7687214173 | | 1978 | -1,375.6388091945 | | 1977 | -1,428.7616143873 | | 1976 | -1,537.4923809673 | | 1975 | -1,790.7021363985 | | 1974 | -1,879.0776389147 | | 1973 | -2,110.8196709331 | | 1972 | -1,640.0633162646 | | 1971 | -2,041.0784852823 |
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