Year | Value | 2021 | 77.254 | 2020 | 77.021 | 2019 | 76.875 | 2018 | 77.207 | 2017 | 75.826 | 2016 | 76.411 | 2015 | 76.261 | 2014 | 77.11 | 2013 | 76.041 | 2012 | 76.12 | 2011 | 75.14 | 2010 | 75.447 | 2009 | 75.281 | 2008 | 75.115 | 2007 | 74.945 | 2006 | 74.795 | 2005 | 74.634 | 2004 | 74.471 | 2003 | 74.307 | 2002 | 74.142 | 2001 | 73.975 | 2000 | 73.806 | 1999 | 73.635 | 1998 | 73.463 | 1997 | 73.279 | 1996 | 73.093 | 1995 | 72.915 | 1994 | 72.725 | 1993 | 72.533 | 1992 | 72.362 | 1991 | 72.957 | 1990 | 71.463 | 1989 | 71.224 | 1988 | 71.204 | 1987 | 70.49 | 1986 | 70.351 | 1985 | 69.472 | 1984 | 69.678 | 1983 | 69.529 | 1982 | 69.962 | 1981 | 69.652 | 1980 | 69.432 | 1979 | 69.322 | 1978 | 69.279 | 1977 | 69.207 | 1976 | 69.182 | 1975 | 69.047 | 1974 | 68.896 | 1973 | 68.784 | 1972 | 68.628 | 1971 | 68.699 | 1970 | 68.66 | 1969 | 67.418 | 1968 | 66.645 | 1967 | 66.8 | 1966 | 66.569 | 1965 | 65.602 | 1964 | 66.86 | 1963 | 66.671 | 1962 | 65.831 | 1961 | 64.742 | 1960 | 64.845 |
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