| Year | Value | | 2014 | -177.98583612486 | | 2013 | -180.95071617881 | | 2012 | -149.09222145601 | | 2011 | -152.2568638712 | | 2010 | -147.9124001356 | | 2009 | -136.95867378752 | | 2008 | -181.12123881269 | | 2007 | -192.13444263161 | | 2006 | -126.30998733008 | | 2005 | -168.39727789843 | | 2004 | -149.93342878602 | | 2003 | -91.660510523326 | | 2002 | -77.028147016152 | | 2001 | -87.053482646052 | | 2000 | -36.808013024774 | | 1999 | -14.104102085983 | | 1998 | -25.306714228851 | | 1997 | -25.58635568352 | | 1996 | -40.345742716047 | | 1995 | -54.597329556261 | | 1994 | -67.488073444271 | | 1993 | -70.527681212399 | | 1992 | -77.439457996063 | | 1991 | -87.7137681496 | | 1990 | -88.585956206851 | | 1989 | -93.468452058469 | | 1988 | -100.84994827118 | | 1987 | -100.57189046454 | | 1986 | -95.331114652195 | | 1985 | -87.483586537489 | | 1984 | -85.96742730225 | | 1983 | -87.898887019552 | | 1982 | -74.897565629344 | | 1981 | -75.880788378913 | | 1980 | -78.569128945546 | | 1979 | -91.330417372109 | | 1978 | -114.63751658773 | | 1977 | -140.3691301094 | | 1976 | -169.35707727984 | | 1975 | -188.01326149237 | | 1974 | -248.76394242582 | | 1973 | -282.70327484037 | | 1972 | -235.72107914351 | | 1971 | -124.87174663641 |
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