Year | Value | 2021 | 74.714634146341 | 2020 | 76.865853658537 | 2019 | 77.665853658537 | 2018 | 77.265853658537 | 2017 | 77.165853658537 | 2016 | 77.165853658537 | 2015 | 76.563414634146 | 2014 | 76.812195121951 | 2013 | 76.412195121951 | 2012 | 76.109756097561 | 2011 | 75.958536585366 | 2010 | 75.112195121951 | 2009 | 74.909756097561 | 2008 | 74.704878048781 | 2007 | 74.207317073171 | 2006 | 74.204878048781 | 2005 | 73.904878048781 | 2004 | 73.958536585366 | 2003 | 73.604878048781 | 2002 | 73.604878048781 | 2001 | 73.40243902439 | 2000 | 73.051219512195 | 1999 | 72.90243902439 | 1998 | 72.551219512195 | 1997 | 72.704878048781 | 1996 | 72.653658536585 | 1995 | 72.253658536585 | 1994 | 72.3 | 1993 | 72.448780487805 | 1992 | 71.795121951219 | 1991 | 70.882926829268 | 1990 | 70.932682926829 | 1989 | 71.026341463415 | 1988 | 71.207804878049 | 1987 | 71.088780487805 | 1986 | 71.021219512195 | 1985 | 70.734634146342 | 1984 | 70.750975609756 | 1983 | 70.479024390244 | 1982 | 70.689024390244 | 1981 | 70.629268292683 | 1980 | 70.408536585366 | 1979 | 70.744731707317 | 1978 | 70.42643902439 | 1977 | 70.423121951219 | 1976 | 70.463195121951 | 1975 | 70.305048780488 | 1974 | 70.178170731707 | 1973 | 70.021390243902 | 1972 | 70.298219512195 | 1971 | 69.86256097561 | 1970 | 69.712585365854 | 1969 | 69.795390243902 | 1968 | 70.436756097561 | 1967 | 70.925585365854 | 1966 | 70.37743902439 | 1965 | 70.235268292683 | 1964 | 71.01987804878 | 1963 | 70.633414634146 | 1962 | 70.270292682927 | 1961 | 70.723902439024 | 1960 | 70.269780487805 |
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