| Year | Value | | 2014 | -391.05848581964 | | 2013 | -387.60930865724 | | 2012 | -365.44569039274 | | 2011 | -376.21034980066 | | 2010 | -319.47316868179 | | 2009 | -315.26536014624 | | 2008 | -433.04032129711 | | 2007 | -458.8733190163 | | 2006 | -487.86899373455 | | 2005 | -458.38398520034 | | 2004 | -462.60480248567 | | 2003 | -452.01190170097 | | 2002 | -390.39897551375 | | 2001 | -460.24805237903 | | 2000 | -510.29685109617 | | 1999 | -497.55158937487 | | 1998 | -599.38353831626 | | 1997 | -683.50879435106 | | 1996 | -691.96028923799 | | 1995 | -676.70856821293 | | 1994 | -689.35561399409 | | 1993 | -766.21436666943 | | 1992 | -577.16234123616 | | 1991 | -273.30582307488 | | 1990 | -452.99044987275 | | 1989 | -319.88310786522 | | 1988 | -311.06095791649 | | 1987 | -321.40492623726 | | 1986 | -328.48175432305 | | 1985 | -333.31443440851 | | 1984 | -429.99712068885 | | 1983 | -390.75700913245 | | 1982 | -304.87629916105 | | 1981 | -518.39600696708 | | 1980 | -795.38834375641 | | 1979 | -1,228.0077675921 | | 1978 | -1,296.2817632556 | | 1977 | -1,291.8808428754 | | 1976 | -1,529.6738281325 | | 1975 | -1,625.8722595946 | | 1974 | -1,894.2080820382 | | 1973 | -2,147.6612485227 | | 1972 | -2,469.7960853015 | | 1971 | -2,534.2766163011 |
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