Year | Value | 2021 | 81.890243902439 | 2020 | 80.69512195122 | 2019 | 81.99512195122 | 2018 | 81.595121951219 | 2017 | 81.492682926829 | 2016 | 81.439024390244 | 2015 | 80.992682926829 | 2014 | 81.287804878049 | 2013 | 80.587804878049 | 2012 | 80.385365853658 | 2011 | 80.585365853659 | 2010 | 80.182926829268 | 2009 | 80.034146341463 | 2008 | 79.680487804878 | 2007 | 79.782926829268 | 2006 | 79.380487804878 | 2005 | 78.980487804878 | 2004 | 78.878048780488 | 2003 | 78.129268292683 | 2002 | 78.075609756098 | 2001 | 77.973170731707 | 2000 | 77.721951219512 | 1999 | 77.619512195122 | 1998 | 77.473170731707 | 1997 | 77.370731707317 | 1996 | 77.187317073171 | 1995 | 76.840731707317 | 1994 | 76.691707317073 | 1993 | 76.345365853659 | 1992 | 76.351219512195 | 1991 | 76.192195121951 | 1990 | 76.051951219512 | 1989 | 75.632682926829 | 1988 | 75.565853658537 | 1987 | 75.365853658537 | 1986 | 74.731707317073 | 1985 | 74.520243902439 | 1984 | 74.404878048781 | 1983 | 73.869024390244 | 1982 | 73.888048780488 | 1981 | 73.621707317073 | 1980 | 73.207073170732 | 1979 | 73.193658536585 | 1978 | 72.698048780488 | 1977 | 72.773902439024 | 1976 | 72.119756097561 | 1975 | 71.971219512195 | 1974 | 71.985853658537 | 1973 | 71.635365853659 | 1972 | 71.405121951219 | 1971 | 71.060487804878 | 1970 | 70.971951219512 | 1969 | 70.764878048781 | 1968 | 70.693170731707 | 1967 | 71.012926829268 | 1966 | 70.706341463415 | 1965 | 70.625365853659 | 1964 | 70.755121951219 | 1963 | 70.051463414634 | 1962 | 70.219512195122 | 1961 | 70.520975609756 | 1960 | 69.701951219512 |
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