Year | Value | 2021 | 75.60243902439 | 2020 | 76.5 | 2019 | 77.904878048781 | 2018 | 77.60243902439 | 2017 | 77.753658536585 | 2016 | 77.851219512195 | 2015 | 77.451219512195 | 2014 | 77.60243902439 | 2013 | 77 | 2012 | 76.746341463415 | 2011 | 76.69512195122 | 2010 | 76.246341463415 | 2009 | 75.69512195122 | 2008 | 75.543902439024 | 2007 | 75.243902439024 | 2006 | 75.143902439024 | 2005 | 74.99512195122 | 2004 | 74.846341463415 | 2003 | 74.59756097561 | 2002 | 74.49756097561 | 2001 | 74.2 | 2000 | 73.748780487805 | 1999 | 73.043902439024 | 1998 | 72.99756097561 | 1997 | 72.646341463415 | 1996 | 72.246341463415 | 1995 | 71.892682926829 | 1994 | 71.69512195122 | 1993 | 71.595121951219 | 1992 | 71.090243902439 | 1991 | 70.587804878049 | 1990 | 70.890243902439 | 1989 | 71.043902439024 | 1988 | 71.331707317073 | 1987 | 70.89756097561 | 1986 | 70.848780487805 | 1985 | 70.548780487805 | 1984 | 70.8 | 1983 | 71 | 1982 | 71.10243902439 | 1981 | 71.051219512195 | 1980 | 70.09756097561 | 1979 | 70.751219512195 | 1978 | 70.351219512195 | 1977 | 70.40243902439 | 1976 | 70.656097560976 | 1975 | 70.560975609756 | 1974 | 71.117073170732 | 1973 | 70.663414634146 | 1972 | 70.665853658537 | 1971 | 69.612195121951 | 1970 | 69.868292682927 | 1969 | 69.719512195122 | 1968 | 70.219512195122 | 1967 | 69.424390243902 | 1966 | 69.826829268293 | 1965 | 69.429268292683 | 1964 | 68.629268292683 | 1963 | 68.375609756098 | 1962 | 67.426829268293 | 1961 | 67.778048780488 | 1960 | 67.680487804878 |
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