Year | Value | 2021 | 77.373170731707 | 2020 | 78.226829268293 | 2019 | 79.229268292683 | 2018 | 79.029268292683 | 2017 | 78.978048780488 | 2016 | 79.026829268293 | 2015 | 78.578048780488 | 2014 | 78.824390243902 | 2013 | 78.175609756098 | 2012 | 78.075609756098 | 2011 | 77.873170731707 | 2010 | 77.424390243902 | 2009 | 77.078048780488 | 2008 | 76.975609756098 | 2007 | 76.724390243903 | 2006 | 76.524390243902 | 2005 | 75.924390243902 | 2004 | 75.721951219512 | 2003 | 75.170731707317 | 2002 | 75.221951219512 | 2001 | 75.173170731707 | 2000 | 74.968292682927 | 1999 | 74.668292682927 | 1998 | 74.514634146342 | 1997 | 73.824878048781 | 1996 | 73.714634146341 | 1995 | 73.074878048781 | 1994 | 72.972682926829 | 1993 | 72.767804878049 | 1992 | 72.271707317073 | 1991 | 71.898292682927 | 1990 | 71.383902439024 | 1989 | 71.675609756098 | 1988 | 71.641463414634 | 1987 | 71.445609756098 | 1986 | 70.997317073171 | 1985 | 71.046341463415 | 1984 | 70.83756097561 | 1983 | 70.591463414634 | 1982 | 70.807804878049 | 1981 | 70.722195121951 | 1980 | 70.278048780488 | 1979 | 70.749512195122 | 1978 | 70.643902439024 | 1977 | 70.573414634146 | 1976 | 70.532682926829 | 1975 | 70.414634146341 | 1974 | 70.086585365854 | 1973 | 70.022682926829 | 1972 | 70.176585365854 | 1971 | 69.677073170732 | 1970 | 69.440243902439 | 1969 | 69.367073170732 | 1968 | 69.840731707317 | 1967 | 70.264146341463 | 1966 | 70.38487804878 | 1965 | 70.163170731707 | 1964 | 70.459512195122 | 1963 | 70.304390243903 | 1962 | 69.786829268293 | 1961 | 70.512682926829 | 1960 | 70.348780487805 |
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