Year | Value | 2021 | 75.637882489063 | 2020 | 76.49691195212 | 2019 | 78.114689887031 | 2018 | 77.903273881539 | 2017 | 77.758356948819 | 2016 | 77.682681695945 | 2015 | 77.633280557874 | 2014 | 77.521181221804 | 2013 | 77.353044891332 | 2012 | 77.159213633386 | 2011 | 76.904157392937 | 2010 | 76.413452288425 | 2009 | 76.540335507239 | 2008 | 76.360370337027 | 2007 | 76.154236163368 | 2006 | 76.017539559247 | 2005 | 75.810775896644 | 2004 | 75.475176913025 | 2003 | 75.138230383076 | 2002 | 75.039998774918 | 2001 | 74.709343766368 | 2000 | 74.429656968582 | 1999 | 73.974261391829 | 1998 | 73.556046400166 | 1997 | 73.33889607751 | 1996 | 72.96888029317 | 1995 | 72.599784129096 | 1994 | 72.247080215816 | 1993 | 71.894916458502 | 1992 | 71.548980333479 | 1991 | 71.198268971771 | 1990 | 70.816483734395 | 1989 | 70.407198868164 | 1988 | 69.973769849499 | 1987 | 69.54248293374 | 1986 | 69.072437534875 | 1985 | 68.427305604407 | 1984 | 68.167103798752 | 1983 | 67.732645280084 | 1982 | 67.206229078119 | 1981 | 66.835900924753 | 1980 | 66.257036961889 | 1979 | 65.817919499089 | 1978 | 65.403756737039 | 1977 | 64.949823274525 | 1976 | 64.252692180509 | 1975 | 63.983621256497 | 1974 | 63.369570867173 | 1973 | 62.943951804146 | 1972 | 62.346755023371 | 1971 | 61.936056353921 | 1970 | 61.036061114342 | 1969 | 61.009332875102 | 1968 | 60.644950422596 | 1967 | 60.231596933579 | 1966 | 59.819711878907 | 1965 | 59.415515630777 | 1964 | 58.962980592044 | 1963 | 58.450134982364 | 1962 | 58.001677122309 | 1961 | 57.537603856011 | 1960 | 56.978917792357 |
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