Year | Value | 2021 | 80.875609756098 | 2020 | 80.531707317073 | 2019 | 81.529268292683 | 2018 | 81.378048780488 | 2017 | 81.029268292683 | 2016 | 81.175609756098 | 2015 | 80.775609756098 | 2014 | 81.078048780488 | 2013 | 80.321951219512 | 2012 | 80.124390243902 | 2011 | 79.970731707317 | 2010 | 79.421951219512 | 2009 | 78.970731707317 | 2008 | 78.765853658537 | 2007 | 78.560975609756 | 2006 | 78.086585365854 | 2005 | 77.612195121951 | 2004 | 77.207317073171 | 2003 | 76.858536585366 | 2002 | 76.007317073171 | 2001 | 75.758536585366 | 2000 | 75.412195121951 | 1999 | 75.009756097561 | 1998 | 74.807317073171 | 1997 | 74.707317073171 | 1996 | 74.458536585366 | 1995 | 73.958536585366 | 1994 | 73.404878048781 | 1993 | 73.253658536585 | 1992 | 73.30487804878 | 1991 | 73.353658536585 | 1990 | 73.204878048781 | 1989 | 72.704878048781 | 1988 | 72.446341463415 | 1987 | 72.00243902439 | 1986 | 71.80243902439 | 1985 | 71.351219512195 | 1984 | 70.90243902439 | 1983 | 70.541463414634 | 1982 | 71.053658536585 | 1981 | 71.204878048781 | 1980 | 71.104878048781 | 1979 | 70.853658536585 | 1978 | 70.70243902439 | 1977 | 70.556097560976 | 1976 | 70.307317073171 | 1975 | 70.358536585366 | 1974 | 70.160975609756 | 1973 | 69.404878048781 | 1972 | 69.058536585366 | 1971 | 68.834146341463 | 1970 | 68.609756097561 | 1969 | 68.360975609756 | 1968 | 68.917073170732 | 1967 | 69.365853658537 | 1966 | 69.012195121951 | 1965 | 68.365853658537 | 1964 | 68.663414634146 | 1963 | 68.621951219512 | 1962 | 68.978048780488 | 1961 | 68.978048780488 | 1960 | 68.978048780488 |
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