Year | Value | 2021 | 83.117073170732 | 2020 | 83.063414634146 | 2019 | 83.163414634146 | 2018 | 82.860975609756 | 2017 | 82.660975609756 | 2016 | 82.204878048781 | 2015 | 82.468292682927 | 2014 | 82.860975609756 | 2013 | 82.060975609756 | 2012 | 82.917073170732 | 2011 | 82.358536585366 | 2010 | 81.89756097561 | 2009 | 81.751219512195 | 2008 | 81.609756097561 | 2007 | 81.453658536585 | 2006 | 81.158536585366 | 2005 | 81.50243902439 | 2004 | 80.99756097561 | 2003 | 80.963414634146 | 2002 | 80.50243902439 | 2001 | 80.690243902439 | 2000 | 79.653658536585 | 1999 | 79.351219512195 | 1998 | 79.60243902439 | 1997 | 78.885365853658 | 1996 | 78.777804878049 | 1995 | 77.984390243902 | 1994 | 79.247073170732 | 1993 | 78.934634146341 | 1992 | 78.760243902439 | 1991 | 77.991951219512 | 1990 | 78.036341463415 | 1989 | 78.140975609756 | 1988 | 77.082926829268 | 1987 | 77.339024390244 | 1986 | 77.990731707317 | 1985 | 77.60243902439 | 1984 | 77.576585365854 | 1983 | 76.845609756098 | 1982 | 77.037804878049 | 1981 | 76.521463414634 | 1980 | 76.846585365854 | 1979 | 76.773170731707 | 1978 | 76.649268292683 | 1977 | 76.373658536585 | 1976 | 76.972195121951 | 1975 | 75.578780487805 | 1974 | 74.511707317073 | 1973 | 74.450975609756 | 1972 | 74.455853658537 | 1971 | 73.570487804878 | 1970 | 73.933902439024 | 1969 | 73.776341463415 | 1968 | 74.005853658537 | 1967 | 73.783170731707 | 1966 | 73.300487804878 | 1965 | 73.868780487805 | 1964 | 73.541707317073 | 1963 | 73.042926829268 | 1962 | 73.721951219512 | 1961 | 73.503414634146 | 1960 | 73.762048780488 |
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