Year | Value | 2014 | 98.680323734707 | 2013 | 99.231662342189 | 2012 | 99.320346566809 | 2011 | 99.22622240789 | 2010 | 99.300061607625 | 2009 | 99.55656786426 | 2008 | 99.53288187249 | 2007 | 99.546041903154 | 2006 | 99.515593412028 | 2005 | 99.595253619792 | 2004 | 99.60124869488 | 2003 | 99.628472999924 | 2002 | 99.617060426235 | 2001 | 99.646142573537 | 2000 | 99.633812243677 | 1999 | 99.692921152888 | 1998 | 99.627149596132 | 1997 | 99.517250428694 | 1996 | 99.53956274992 | 1995 | 99.559287837404 | 1994 | 99.576586893796 | 1993 | 99.572504683417 | 1992 | 99.589220747172 | 1991 | 99.514615998498 | 1990 | 99.496484500971 | 1989 | 99.540638025093 | 1988 | 99.532753505453 | 1987 | 99.48827584761 | 1986 | 99.446254093144 | 1985 | 99.362014539279 | 1984 | 99.353699711625 | 1983 | 99.345632338672 | 1982 | 99.291957239881 | 1981 | 99.244854421978 | 1980 | 99.163733031454 | 1979 | 99.175980416399 | 1978 | 99.291010845244 | 1977 | 99.25020290788 | 1976 | 99.116257631657 | 1975 | 99.055072633094 | 1974 | 99.024593544839 | 1973 | 98.969766617512 | 1972 | 98.958444591886 | 1971 | 98.966504345879 |
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