| Year | Value | | 2014 | -274.13316074609 | | 2013 | -268.53275583505 | | 2012 | -294.762437575 | | 2011 | -285.14359206076 | | 2010 | -239.49373490998 | | 2009 | -219.85897694743 | | 2008 | -212.71636674078 | | 2007 | -206.03410510293 | | 2006 | -193.68562862324 | | 2005 | -190.20754209052 | | 2004 | -189.69499279388 | | 2003 | -185.32482452546 | | 2002 | -171.15200159149 | | 2001 | -180.45846332184 | | 2000 | -180.20008587749 | | 1999 | -194.07440519668 | | 1998 | -153.08835732011 | | 1997 | -143.25353291034 | | 1996 | -129.32605902032 | | 1995 | -114.65330004238 | | 1994 | -85.895344963588 | | 1993 | -85.329633205333 | | 1992 | -91.150517914508 | | 1991 | -89.282323529825 | | 1990 | -98.901703594638 | | 1989 | -88.543209401051 | | 1988 | -73.298672085803 | | 1987 | -75.791632105367 | | 1986 | -51.015242526062 | | 1985 | -24.724790409288 | | 1984 | -15.515331551233 | | 1983 | -8.1309501434807 | | 1982 | -6.3214147328482 | | 1981 | -2.8682309677234 | | 1980 | 0.0048119221810464 | | 1979 | -9.6171562308509 | | 1978 | -6.2796227750055 | | 1977 | -1.0169633245822 | | 1976 | -4.0272165790656 | | 1975 | -10.598160296169 | | 1974 | -14.256349959396 | | 1973 | -23.230979084506 | | 1972 | -30.986948336537 | | 1971 | -39.839774584195 |
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