Year | Value | 2021 | 80.900975609756 | 2020 | 81.041463414634 | 2019 | 81.292682926829 | 2018 | 80.892682926829 | 2017 | 80.992682926829 | 2016 | 80.990243902439 | 2015 | 80.641463414634 | 2014 | 81.090243902439 | 2013 | 80.490243902439 | 2012 | 80.539024390244 | 2011 | 80.436585365854 | 2010 | 79.987804878049 | 2009 | 79.836585365854 | 2008 | 79.736585365854 | 2007 | 79.534146341463 | 2006 | 79.131707317073 | 2005 | 78.931707317073 | 2004 | 78.680487804878 | 2003 | 78.380487804878 | 2002 | 78.229268292683 | 2001 | 78.329268292683 | 2000 | 77.926829268293 | 1999 | 77.726829268293 | 1998 | 77.475609756098 | 1997 | 77.073170731707 | 1996 | 76.673170731707 | 1995 | 76.421951219512 | 1994 | 76.270731707317 | 1993 | 75.870731707317 | 1992 | 75.819512195122 | 1991 | 75.319512195122 | 1990 | 75.085634146342 | 1989 | 75.191536585366 | 1988 | 74.998731707317 | 1987 | 74.807024390244 | 1986 | 74.396829268293 | 1985 | 74.189097560976 | 1984 | 74.072292682927 | 1983 | 73.622146341463 | 1982 | 73.333146341463 | 1981 | 73.040219512195 | 1980 | 72.800317073171 | 1979 | 72.630170731707 | 1978 | 72.290414634146 | 1977 | 72.307317073171 | 1976 | 71.712219512195 | 1975 | 71.259243902439 | 1974 | 71.418926829268 | 1973 | 71.112804878049 | 1972 | 70.906707317073 | 1971 | 70.676756097561 | 1970 | 70.447195121951 | 1969 | 70.228804878049 | 1968 | 70.378463414634 | 1967 | 70.731731707317 | 1966 | 70.521585365854 | 1965 | 70.410365853659 | 1964 | 70.43556097561 | 1963 | 69.914073170732 | 1962 | 69.799219512195 | 1961 | 69.64487804878 | 1960 | 69.064073170732 |
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