Year | Value | 2022 | 78.259162194955 | 2021 | 76.315007664474 | 2020 | 74.400605876493 | 2019 | 76.836758416614 | 2018 | 76.915882731686 | 2017 | 76.726735337067 | 2016 | 76.502754575769 | 2015 | 75.367513550708 | 2014 | 74.468728768916 | 2013 | 73.471401974788 | 2012 | 71.673612418193 | 2011 | 70.455785545461 | 2010 | 69.134223842711 | 2009 | 69.534753449848 | 2008 | 69.45456218693 | 2007 | 64.36929824916 | 2006 | 63.793966257034 | 2005 | 68.443689346827 | 2004 | 69.274633750462 | 2003 | 72.172335094535 | 2002 | 73.861023382715 | 2001 | 74.358930530429 | 2000 | 74.713659779496 | 1999 | 75.526907368225 | 1998 | 74.930329397853 | 1997 | 72.484023987009 | 1996 | 72.138643629398 | 1995 | 72.386298556695 | 1994 | 74.58505266319 | 1993 | 75.940645513069 | 1992 | 74.826613499944 | 1991 | 72.97614349556 | 1990 | 71.617815532444 | 1989 | 70.21954439669 | 1988 | 70.273454391134 | 1987 | 74.886820028697 | 1986 | 78.05647446434 | 1985 | 79.817091366257 | 1984 | 83.192577287781 | 1983 | 86.003250683736 | 1982 | 90.949443389436 | 1981 | 88.184909995533 | 1980 | 83.139369348359 | 1979 | 85.041051737152 | 1978 | 85.531974952185 | 1977 | 87.377423355939 | 1976 | 82.889784007512 | 1975 | 88.868956572531 | 1974 | 78.170732449949 | 1973 | 93.943138060864 | 1972 | 91.325040193154 | 1971 | 86.529268621287 | 1970 | 82.901328022745 | 1969 | 82.538155421068 | 1968 | 82.866689223483 | 1967 | 82.537217206778 | 1966 | 82.515220698756 | 1965 | 84.245421444535 | 1964 | 86.755521708795 | 1963 | 87.648757942905 | 1962 | 89.010794550093 | 1961 | 88.979336255349 | 1960 | 88.956623680602 |
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