Year | Value | 2021 | 80.138339920949 | 2020 | 80.138339920949 | 2019 | 80.138339920949 | 2018 | 80.148221343874 | 2017 | 79.644268774704 | 2016 | 77.602108036891 | 2015 | 73.221343873518 | 2014 | 74.976943346509 | 2013 | 74.179841897233 | 2012 | 75.273386034256 | 2011 | 76.152832674572 | 2010 | 76.613965744401 | 2009 | 77.042160737813 | 2008 | 77.799736495389 | 2007 | 76.71277997365 | 2006 | 75.98814229249 | 2005 | 76.646903820817 | 2004 | 76.218708827404 | 2003 | 75.889328063241 | 2002 | 75.889328063241 | 2001 | 76.877470355731 | 2000 | 76.877470355731 | 1999 | 76.71277997365 | 1998 | 76.71277997365 | 1997 | 76.71277997365 | 1996 | 76.613965744401 | 1995 | 76.548089591568 | 1994 | 76.71277997365 | 1993 | 76.877470355731 | 1992 | 76.943346508564 | 1991 | 76.515151515152 | 1990 | 76.449275362319 | 1989 | 75.922266139657 | 1988 | 77.173913043478 | 1987 | 76.745718050066 | 1986 | 75.461133069829 | 1985 | 76.021080368906 | 1984 | 75.790513833992 | 1983 | 75.329380764163 | 1982 | 75.494071146245 | 1981 | 75.823451910408 | 1980 | 75.62582345191 | 1979 | 76.054018445323 | 1978 | 75.527009222661 | 1977 | 75.494071146245 | 1976 | 77.70092226614 | 1975 | 78.260869565217 | 1974 | 77.70092226614 | 1973 | 77.70092226614 | 1972 | 77.70092226614 | 1971 | 77.865612648221 | 1970 | 79.940711462451 | 1969 | 81.620553359684 | 1968 | 83.432147562582 | 1967 | 85.079051383399 | 1966 | 85.079051383399 | 1965 | 84.914361001318 | 1964 | 84.914361001318 | 1963 | 84.848484848485 | 1962 | 84.848484848485 | 1961 | 85.013175230567 |
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