Year | Value | 2021 | 74.864260051907 | 2020 | 76.129395327564 | 2019 | 76.728072132137 | 2018 | 76.535004124031 | 2017 | 76.283490805491 | 2016 | 76.018358505917 | 2015 | 75.723817746974 | 2014 | 75.454292366099 | 2013 | 75.137904114642 | 2012 | 74.816809662059 | 2011 | 74.470540761262 | 2010 | 74.130037066015 | 2009 | 73.846295449686 | 2008 | 73.452367618907 | 2007 | 73.248640925001 | 2006 | 72.932802247636 | 2005 | 72.552170729352 | 2004 | 72.095208224186 | 2003 | 71.842173433215 | 2002 | 71.548096221652 | 2001 | 71.224277309433 | 2000 | 70.689801337974 | 1999 | 70.277221882405 | 1998 | 70.112137905062 | 1997 | 69.710433422702 | 1996 | 69.364747691221 | 1995 | 69.092024857083 | 1994 | 68.747565609293 | 1993 | 68.504211899078 | 1992 | 68.174029267091 | 1991 | 67.856502853991 | 1990 | 67.672136922991 | 1989 | 67.445620937879 | 1988 | 67.105437156689 | 1987 | 66.763033370326 | 1986 | 66.397594614635 | 1985 | 65.897205383465 | 1984 | 65.500648147808 | 1983 | 65.125994839056 | 1982 | 64.652855364233 | 1981 | 64.16488589414 | 1980 | 63.644872913864 | 1979 | 63.13431828634 | 1978 | 62.589794468176 | 1977 | 62.056684538778 | 1976 | 61.424306132928 | 1975 | 60.864322178758 | 1974 | 60.235407267252 | 1973 | 59.615040428848 | 1972 | 58.947674115785 | 1971 | 58.489932643563 | 1970 | 57.887840104884 | 1969 | 57.340724506656 | 1968 | 56.942040291358 | 1967 | 56.24158210357 | 1966 | 55.760790869076 | 1965 | 55.176926388847 | 1964 | 55.305702446047 | 1963 | 54.787262481589 | 1962 | 54.322646493257 | 1961 | 50.516149462026 | 1960 | 47.597931135307 |
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