Year | Value | 2021 | 83.3 | 2020 | 83.2 | 2019 | 82.9 | 2018 | 82.748780487805 | 2017 | 82.5 | 2016 | 82.448780487805 | 2015 | 82.4 | 2014 | 82.3 | 2013 | 82.148780487805 | 2012 | 82.046341463415 | 2011 | 81.895121951219 | 2010 | 81.69512195122 | 2009 | 81.543902439024 | 2008 | 81.395121951219 | 2007 | 81.292682926829 | 2006 | 81.041463414634 | 2005 | 80.841463414634 | 2004 | 80.490243902439 | 2003 | 80.239024390244 | 2002 | 79.936585365854 | 2001 | 79.634146341463 | 2000 | 79.234146341463 | 1999 | 78.931707317073 | 1998 | 78.631707317073 | 1997 | 78.480487804878 | 1996 | 78.078048780488 | 1995 | 77.829268292683 | 1994 | 77.878048780488 | 1993 | 77.878048780488 | 1992 | 77.378048780488 | 1991 | 77.275609756098 | 1990 | 76.994634146341 | 1989 | 76.713658536585 | 1988 | 76.432682926829 | 1987 | 76.151707317073 | 1986 | 75.870731707317 | 1985 | 75.629268292683 | 1984 | 75.387804878049 | 1983 | 75.146341463415 | 1982 | 74.904878048781 | 1981 | 74.663414634146 | 1980 | 74.333658536585 | 1979 | 74.003902439024 | 1978 | 73.674146341463 | 1977 | 73.344390243902 | 1976 | 73.014634146342 | 1975 | 72.625365853659 | 1974 | 72.236097560976 | 1973 | 71.846829268293 | 1972 | 71.45756097561 | 1971 | 71.068292682927 | 1970 | 71.018536585366 | 1969 | 70.968780487805 | 1968 | 70.919024390244 | 1967 | 70.869268292683 | 1966 | 70.819512195122 | 1965 | 70.850243902439 | 1964 | 70.880975609756 | 1963 | 70.911707317073 | 1962 | 70.94243902439 | 1961 | 70.973170731707 | 1960 | 70.817073170732 |
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