Year | Value | 2021 | 80.068292682927 | 2020 | 79.819512195122 | 2019 | 79.668292682927 | 2018 | 79.519512195122 | 2017 | 79.368292682927 | 2016 | 79.168292682927 | 2015 | 79.017073170732 | 2014 | 78.868292682927 | 2013 | 78.717073170732 | 2012 | 78.517073170732 | 2011 | 78.317073170732 | 2010 | 77.865853658537 | 2009 | 77.514634146342 | 2008 | 77.163414634146 | 2007 | 76.863414634146 | 2006 | 78.324390243902 | 2005 | 77.421951219512 | 2004 | 77.773170731707 | 2003 | 77.521951219512 | 2002 | 77.521951219512 | 2001 | 77.621951219512 | 2000 | 76.619512195122 | 1999 | 72.196853658537 | 1998 | 72.325829268293 | 1997 | 72.203292682927 | 1996 | 72.387317073171 | 1995 | 72.009975609756 | 1994 | 71.99512195122 | 1993 | 71.817707317073 | 1992 | 71.652243902439 | 1991 | 71.451780487805 | 1990 | 71.250463414634 | 1989 | 71.002463414634 | 1988 | 70.763268292683 | 1987 | 70.337902439024 | 1986 | 70.01756097561 | 1985 | 69.742804878049 | 1984 | 69.529536585366 | 1983 | 69.32456097561 | 1982 | 69.106414634146 | 1981 | 68.695512195122 | 1980 | 68.529146341463 | 1979 | 68.220219512195 | 1978 | 68.048634146341 | 1977 | 67.881341463415 | 1976 | 67.661780487805 | 1975 | 67.467804878049 | 1974 | 67.283682926829 | 1973 | 67.070487804878 | 1972 | 66.389878048781 | 1971 | 66.183219512195 | 1970 | 65.838682926829 | 1969 | 65.759195121951 | 1968 | 65.637170731707 | 1967 | 65.223951219512 | 1966 | 64.928024390244 | 1965 | 65.273 | 1964 | 64.618073170732 | 1963 | 63.423487804878 | 1962 | 63.658097560976 | 1961 | 63.784536585366 | 1960 | 63.745975609756 |
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