Year | Value | 2015 | 80.091791966968 | 2014 | 76.258860302812 | 2013 | 73.192068737735 | 2012 | 73.704031822955 | 2011 | 71.386262987604 | 2010 | 74.261182803388 | 2009 | 73.432790431474 | 2008 | 75.648546376886 | 2007 | 74.384930637957 | 2006 | 76.134427963785 | 2005 | 76.111097846146 | 2004 | 76.412718938987 | 2003 | 76.385408145355 | 2002 | 75.768747171961 | 2001 | 77.009481138626 | 2000 | 76.368840790276 | 1999 | 75.772443667522 | 1998 | 77.071649681176 | 1997 | 76.167169351578 | 1996 | 78.02540972763 | 1995 | 77.64908961267 | 1994 | 77.847379421119 | 1993 | 75.520734859579 | 1992 | 74.867048208853 | 1991 | 74.094733761714 | 1990 | 72.664766027621 | 1989 | 72.82017883855 | 1988 | 71.557096301279 | 1987 | 68.961254428018 | 1986 | 67.852914793418 | 1985 | 68.359483145086 | 1984 | 71.645062379459 | 1983 | 73.261817918515 | 1982 | 78.139339576406 | 1981 | 81.220702304598 | 1980 | 82.695658131349 | 1979 | 84.456408295871 | 1978 | 82.575172426863 | 1977 | 79.922076692366 | 1976 | 80.87422464532 | 1975 | 81.179219387926 | 1974 | 86.353423626042 | 1973 | 85.847255437912 | 1972 | 84.883122926029 | 1971 | 82.741679856434 | 1970 | 82.165708132295 | 1969 | 77.911510677523 | 1968 | 73.166330619618 | 1967 | 66.274357110532 | 1966 | 62.420205053128 | 1965 | 58.107180876028 | 1964 | 53.117939860923 | 1963 | 52.755791655675 | 1962 | 48.940451991688 | 1961 | 43.144162424121 | 1960 | 39.309127220393 |
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