Year | Value | 2021 | 62.955436202642 | 2020 | 65.495717811003 | 2019 | 65.669908549862 | 2018 | 65.553781390623 | 2017 | 65.16185222819 | 2016 | 64.755407170852 | 2015 | 64.305414428799 | 2014 | 64.827986645377 | 2013 | 64.987661489331 | 2012 | 65.800551604006 | 2011 | 66.119901291915 | 2010 | 66.308607925679 | 2009 | 66.684859921614 | 2008 | 67.194077514879 | 2007 | 62.069966613442 | 2006 | 61.837712294963 | 2005 | 62.44737988097 | 2004 | 62.490927565684 | 2003 | 63.434460734504 | 2002 | 63.478008419219 | 2001 | 64.015096530701 | 2000 | 63.814196545217 | 1999 | 63.627812454638 | 1998 | 63.426912469154 | 1997 | 63.22601248367 | 1996 | 63.025112498185 | 1995 | 63.705907969226 | 1994 | 63.77703585426 | 1993 | 63.975903614458 | 1992 | 64.105095079112 | 1991 | 64.520249673392 | 1990 | 65.864421541588 | 1989 | 67.886485701843 | 1988 | 69.683553491073 | 1987 | 69.923065757004 | 1986 | 70.328059224851 | 1985 | 70.889824357672 | 1984 | 71.03208012774 | 1983 | 70.786761503847 | 1982 | 71.058208738569 | 1981 | 71.259979677747 | 1980 | 71.585135723617 | 1979 | 71.072724633474 | 1978 | 70.91450137901 | 1977 | 70.849179851938 | 1976 | 70.431122078676 | 1975 | 70.191609812745 | 1974 | 70.38467121498 | 1973 | 70.285963129627 | 1972 | 70.074031064015 | 1971 | 70.024677021338 | 1970 | 69.593554942662 | 1969 | 69.908549862099 | 1968 | 69.718391638844 | 1967 | 69.423718972275 | 1966 | 69.004209609522 | 1965 | 68.337930033387 | 1964 | 67.638263898969 | 1963 | 67.018435186529 | 1962 | 66.971984322834 | 1961 | 66.163448976629 |
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