Year | Value | 2021 | 77.898 | 2020 | 77.869 | 2019 | 77.834 | 2018 | 77.796 | 2017 | 77.772 | 2016 | 77.814 | 2015 | 78.052 | 2014 | 78.004 | 2013 | 77.903 | 2012 | 77.895 | 2011 | 78.067 | 2010 | 77.632 | 2009 | 77.829 | 2008 | 77.341 | 2007 | 77.355 | 2006 | 76.75 | 2005 | 76.515 | 2004 | 74.162 | 2003 | 75.825 | 2002 | 75.464 | 2001 | 75.425 | 2000 | 75.121 | 1999 | 75.46 | 1998 | 75.483 | 1997 | 75.23 | 1996 | 74.999 | 1995 | 74.767 | 1994 | 74.349 | 1993 | 74.068 | 1992 | 73.779 | 1991 | 73.501 | 1990 | 73.216 | 1989 | 72.952 | 1988 | 72.711 | 1987 | 72.463 | 1986 | 72.444 | 1985 | 72.107 | 1984 | 71.826 | 1983 | 70.977 | 1982 | 71.115 | 1981 | 70.835 | 1980 | 70.375 | 1979 | 70.051 | 1978 | 69.793 | 1977 | 69.57 | 1976 | 70.324 | 1975 | 69.99 | 1974 | 69.606 | 1973 | 69.221 | 1972 | 68.846 | 1971 | 68.462 | 1970 | 68.219 | 1969 | 67.81 | 1968 | 67.409 | 1967 | 66.599 | 1966 | 66.439 | 1965 | 66.773 | 1964 | 66.726 | 1963 | 65.798 | 1962 | 64.576 | 1961 | 63.489 | 1960 | 62.406 |
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