Year | Value | 2015 | 76.417982106552 | 2014 | 75.00130370141 | 2013 | 76.338774185009 | 2012 | 78.333847661304 | 2011 | 80.982135399527 | 2010 | 81.002671817275 | 2009 | 81.330766242907 | 2008 | 81.882386063197 | 2007 | 83.085430156554 | 2006 | 83.715125335655 | 2005 | 83.792083304267 | 2004 | 84.064837070475 | 2003 | 83.538257054447 | 2002 | 83.700342307695 | 2001 | 84.423069608337 | 2000 | 83.577038467997 | 1999 | 82.639022489153 | 1998 | 81.728601733705 | 1997 | 81.145993099247 | 1996 | 80.960961328521 | 1995 | 81.512307872017 | 1994 | 79.870484417578 | 1993 | 80.938750623778 | 1992 | 81.736186499097 | 1991 | 82.634121247032 | 1990 | 82.727968160303 | 1989 | 82.659640355966 | 1988 | 81.735594461486 | 1987 | 82.245702954301 | 1986 | 81.034945433445 | 1985 | 82.390516097168 | 1984 | 82.242455023613 | 1983 | 82.773171217538 | 1982 | 81.907290185516 | 1981 | 83.730668876626 | 1980 | 84.793968840287 | 1979 | 84.399975262908 | 1978 | 83.405514719663 | 1977 | 83.053797678366 | 1976 | 82.766349597727 | 1975 | 82.031472713206 | 1974 | 82.598861348129 | 1973 | 82.887626033466 | 1972 | 81.959087061334 | 1971 | 81.469703855908 | 1970 | 81.78305684979 | 1969 | 81.146937543677 | 1968 | 80.562298720933 | 1967 | 79.296512969543 | 1966 | 77.788959908927 | 1965 | 76.625423719994 | 1964 | 74.877002837501 | 1963 | 74.407470739728 | 1962 | 72.578898664911 | 1961 | 68.629965988285 | 1960 | 65.316701624057 |
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