Year | Value | 2015 | 76.86056368436 | 2014 | 71.66828630583 | 2013 | 73.173078965038 | 2012 | 78.042715886815 | 2011 | 75.789844260167 | 2010 | 75.313341406495 | 2009 | 79.774486752779 | 2008 | 81.87672286198 | 2007 | 81.681780289115 | 2006 | 82.638216192602 | 2005 | 86.340236617061 | 2004 | 84.914617777455 | 2003 | 82.730424381424 | 2002 | 85.889376482523 | 2001 | 83.468322553445 | 2000 | 84.361729413483 | 1999 | 86.204444636592 | 1998 | 83.600899720086 | 1997 | 82.205931849832 | 1996 | 81.029613884541 | 1995 | 83.567382316697 | 1994 | 80.910317385609 | 1993 | 81.592506167909 | 1992 | 83.700443944968 | 1991 | 79.990736457521 | 1990 | 79.779212883968 | 1989 | 84.191145128732 | 1988 | 82.987314051339 | 1987 | 84.34099262838 | 1986 | 84.757521278959 | 1985 | 82.279665627396 | 1984 | 84.385271980391 | 1983 | 85.669098209239 | 1982 | 86.928668655855 | 1981 | 87.423071205439 | 1980 | 85.169671146707 | 1979 | 81.238420303013 | 1978 | 80.202473869103 | 1977 | 79.496628149702 | 1976 | 85.772737603894 | 1975 | 82.737088472669 | 1974 | 80.043895050396 | 1973 | 79.680527183363 | 1972 | 78.122737429846 | 1971 | 77.939189614461 | 1970 | 75.571668641468 | 1969 | 69.784601124423 | 1968 | 67.734042347349 | 1967 | 66.022534326707 | 1966 | 63.971707601927 | 1965 | 65.538182257223 | 1964 | 63.651556946402 | 1963 | 62.91295042478 | 1962 | 60.853744858084 | 1961 | 59.74273135413 | 1960 | 57.573891233579 |
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