Year | Value | 2021 | 72.074902519305 | 2020 | 72.927954848926 | 2019 | 74.971823960075 | 2018 | 74.776488391304 | 2017 | 74.655349652733 | 2016 | 74.48797043987 | 2015 | 74.521164536862 | 2014 | 74.459693428845 | 2013 | 74.249805704993 | 2012 | 73.995595593021 | 2011 | 73.764760082954 | 2010 | 73.267909881398 | 2009 | 73.379425481015 | 2008 | 73.171125444677 | 2007 | 72.945172211485 | 2006 | 72.801944231779 | 2005 | 72.589309140443 | 2004 | 72.209809038721 | 2003 | 71.881389115509 | 2002 | 71.694132616022 | 2001 | 71.338289076609 | 2000 | 71.07894917885 | 1999 | 70.760908809735 | 1998 | 70.351738329535 | 1997 | 70.098100450077 | 1996 | 69.734341463151 | 1995 | 69.354960665356 | 1994 | 69.039386783959 | 1993 | 68.65192016421 | 1992 | 68.316377811076 | 1991 | 67.976994926582 | 1990 | 67.610442549725 | 1989 | 67.315163336064 | 1988 | 66.964986974606 | 1987 | 66.542978021448 | 1986 | 66.108557626695 | 1985 | 65.499989132006 | 1984 | 65.167600516791 | 1983 | 64.742490481737 | 1982 | 64.174942318143 | 1981 | 63.832635197865 | 1980 | 63.327388057191 | 1979 | 62.890341833642 | 1978 | 62.532809832356 | 1977 | 62.15446483749 | 1976 | 61.576839339312 | 1975 | 61.343504056653 | 1974 | 60.804946932261 | 1973 | 60.381866403038 | 1972 | 59.829430310196 | 1971 | 59.462471437446 | 1970 | 58.63050147224 | 1969 | 58.567126644639 | 1968 | 58.213366943571 | 1967 | 57.829815193869 | 1966 | 57.437112191437 | 1965 | 57.015001569818 | 1964 | 56.612890850558 | 1963 | 56.113680139774 | 1962 | 55.670493360257 | 1961 | 55.21742758135 | 1960 | 54.659327304628 |
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