Year | Value | 2021 | 76.936 | 2020 | 76.239 | 2019 | 77.304 | 2018 | 77.212 | 2017 | 77.16 | 2016 | 77.064 | 2015 | 76.918 | 2014 | 76.757 | 2013 | 76.626 | 2012 | 76.461 | 2011 | 76.234 | 2010 | 75.763 | 2009 | 75.431 | 2008 | 75.274 | 2007 | 75.046 | 2006 | 74.81 | 2005 | 74.588 | 2004 | 74.153 | 2003 | 73.628 | 2002 | 73.337 | 2001 | 72.974 | 2000 | 72.467 | 1999 | 72.136 | 1998 | 71.879 | 1997 | 71.483 | 1996 | 71.273 | 1995 | 71.011 | 1994 | 70.705 | 1993 | 70.303 | 1992 | 69.925 | 1991 | 69.366 | 1990 | 68.948 | 1989 | 68.491 | 1988 | 67.972 | 1987 | 67.4 | 1986 | 66.921 | 1985 | 66.33 | 1984 | 65.689 | 1983 | 65.053 | 1982 | 64.304 | 1981 | 63.472 | 1980 | 62.698 | 1979 | 61.697 | 1978 | 60.872 | 1977 | 59.947 | 1976 | 58.966 | 1975 | 58.068 | 1974 | 57.017 | 1973 | 55.932 | 1972 | 54.792 | 1971 | 53.773 | 1970 | 52.715 | 1969 | 51.816 | 1968 | 50.915 | 1967 | 50.053 | 1966 | 49.343 | 1965 | 48.782 | 1964 | 48.148 | 1963 | 47.609 | 1962 | 47.1 | 1961 | 46.484 | 1960 | 45.94 |
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