Year | Value | 2021 | 82.860975609756 | 2020 | 82.348780487805 | 2019 | 82.858536585366 | 2018 | 82.448780487805 | 2017 | 82.346341463415 | 2016 | 82.453658536585 | 2015 | 81.89756097561 | 2014 | 82.046341463415 | 2013 | 81.746341463415 | 2012 | 80.746341463415 | 2011 | 80.746341463415 | 2010 | 81.39756097561 | 2009 | 80.241463414634 | 2008 | 79.636585365854 | 2007 | 79.792682926829 | 2006 | 79.439024390244 | 2005 | 79.3 | 2004 | 79.253658536585 | 2003 | 78.546341463415 | 2002 | 78.739024390244 | 2001 | 78.843902439024 | 2000 | 78.348780487805 | 1999 | 77.5 | 1998 | 77.587804878049 | 1997 | 77.739024390244 | 1996 | 77.341463414634 | 1995 | 77.290243902439 | 1994 | 76.499853658537 | 1993 | 76.599341463415 | 1992 | 75.277121951219 | 1991 | 75.355463414634 | 1990 | 75.879975609756 | 1989 | 75.304121951219 | 1988 | 74.710073170732 | 1987 | 74.506243902439 | 1986 | 73.623219512195 | 1985 | 73.063682926829 | 1984 | 72.878975609756 | 1983 | 72.520926829268 | 1982 | 70.829804878049 | 1981 | 72.535219512195 | 1980 | 72.039 | 1979 | 71.894268292683 | 1978 | 71.785414634146 | 1977 | 71.694219512195 | 1976 | 71.469341463415 | 1975 | 71.531634146342 | 1974 | 71.513634146342 | 1973 | 70.468707317073 | 1972 | 70.724390243902 | 1971 | 69.222536585366 | 1970 | 69.06556097561 | 1969 | 68.809219512195 | 1968 | 69.66043902439 | 1967 | 69.009780487805 | 1966 | 68.634512195122 | 1965 | 68.40156097561 | 1964 | 68.798048780488 | 1963 | 67.871951219512 | 1962 | 68.385926829268 | 1961 | 68.013609756098 | 1960 | 68.214292682927 |
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