Year | Value | 2021 | 52.484894120832 | 2020 | 52.331679223284 | 2019 | 52.458491725873 | 2018 | 52.408209711446 | 2017 | 52.638713827628 | 2016 | 52.577247359698 | 2015 | 53.189062184161 | 2014 | 53.133683852782 | 2013 | 53.443953539513 | 2012 | 53.861378221147 | 2011 | 54.04096983276 | 2010 | 55.088898222036 | 2009 | 56.090322063129 | 2008 | 56.419406575782 | 2007 | 56.107872012182 | 2006 | 57.342979678544 | 2005 | 58.434350517943 | 2004 | 58.237509515606 | 2003 | 58.398269265439 | 2002 | 58.951186277653 | 2001 | 59.215277220573 | 2000 | 59.65130260521 | 1999 | 59.622777510812 | 1998 | 59.983181162902 | 1997 | 60.185407656575 | 1996 | 60.345587057504 | 1995 | 59.504645202627 | 1994 | 60.433685728015 | 1993 | 60.133349351273 | 1992 | 60.62590100913 | 1991 | 60.810107320199 | 1990 | 61.012333813871 | 1989 | 61.470847349031 | 1988 | 61.224571520103 | 1987 | 61.27062309787 | 1986 | 61.288643280474 | 1985 | 61.492872016659 | 1984 | 61.324683645683 | 1983 | 61.652283603308 | 1982 | 62.449445401033 | 1981 | 62.479477836063 | 1980 | 62.542294832523 | 1979 | 62.76774632662 | 1978 | 63.015234320261 | 1977 | 63.238179124795 | 1976 | 63.086254178594 | 1975 | 63.889278065769 | 1974 | 64.188094047023 | 1973 | 64.588418904318 | 1972 | 65.164672455881 | 1971 | 65.396774580816 | 1970 | 64.266277161951 | 1969 | 65.082636359998 | 1968 | 64.346312377446 | 1967 | 64.79250870383 | 1966 | 64.340309736284 | 1965 | 65.416783384689 | 1964 | 65.534835327544 | 1963 | 66.303173396294 | 1962 | 66.493257033095 | 1961 | 66.48925527232 |
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