Year | Value | 2021 | 82.596609756098 | 2020 | 81.670487804878 | 2019 | 82.228780487805 | 2018 | 81.843902439024 | 2017 | 81.832926829268 | 2016 | 81.92487804878 | 2015 | 81.815609756098 | 2014 | 81.784390243902 | 2013 | 81.744878048781 | 2012 | 81.663658536585 | 2011 | 81.482682926829 | 2010 | 81.322195121951 | 2009 | 81.066097560976 | 2008 | 80.724634146342 | 2007 | 80.543658536585 | 2006 | 80.543658536585 | 2005 | 80.112682926829 | 2004 | 79.992195121951 | 2003 | 79.71512195122 | 2002 | 79.530731707317 | 2001 | 79.398048780488 | 2000 | 79.166829268293 | 1999 | 78.839024390244 | 1998 | 78.623658536585 | 1997 | 78.41243902439 | 1996 | 78.220243902439 | 1995 | 77.977317073171 | 1994 | 77.871707317073 | 1993 | 77.704878048781 | 1992 | 77.838048780488 | 1991 | 77.593414634146 | 1990 | 77.436585365854 | 1989 | 77.124878048781 | 1988 | 76.858780487805 | 1987 | 76.778780487805 | 1986 | 76.463902439024 | 1985 | 76.327317073171 | 1984 | 76.331951219512 | 1983 | 76.060487804878 | 1982 | 75.72512195122 | 1981 | 75.497804878049 | 1980 | 75.102195121951 | 1979 | 74.866341463415 | 1978 | 74.529756097561 | 1977 | 74.215609756098 | 1976 | 73.856097560976 | 1975 | 73.521707317073 | 1974 | 73.23756097561 | 1973 | 73.162682926829 | 1972 | 72.933902439024 | 1971 | 73.029268292683 | 1970 | 72.700487804878 | 1969 | 72.501463414634 | 1968 | 72.353414634146 | 1967 | 72.207804878049 | 1966 | 72.004390243902 | 1965 | 71.872195121951 | 1964 | 71.776341463415 | 1963 | 71.380731707317 | 1962 | 71.367073170732 | 1961 | 71.346097560976 | 1960 | 71.133170731707 |
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