Year | Value | 2021 | 75.3 | 2020 | 76.225 | 2019 | 77.241 | 2018 | 77.093 | 2017 | 76.935 | 2016 | 76.808 | 2015 | 76.182 | 2014 | 75.659 | 2013 | 76.33 | 2012 | 77.191 | 2011 | 77.007 | 2010 | 77.073 | 2009 | 76.976 | 2008 | 76.838 | 2007 | 76.161 | 2006 | 76.247 | 2005 | 75.42 | 2004 | 76.133 | 2003 | 75.782 | 2002 | 74.612 | 2001 | 75.06 | 2000 | 74.496 | 1999 | 75.076 | 1998 | 73.901 | 1997 | 73.686 | 1996 | 73.43 | 1995 | 70.284 | 1994 | 67.209 | 1993 | 51.519 | 1992 | 51.785 | 1991 | 72.089 | 1990 | 72.349 | 1989 | 71.781 | 1988 | 71.755 | 1987 | 71.676 | 1986 | 71.239 | 1985 | 70.799 | 1984 | 71.036 | 1983 | 71.081 | 1982 | 70.875 | 1981 | 70.7 | 1980 | 70.543 | 1979 | 70.34 | 1978 | 70.132 | 1977 | 70.041 | 1976 | 69.648 | 1975 | 69.405 | 1974 | 68.862 | 1973 | 68.216 | 1972 | 67.672 | 1971 | 67.163 | 1970 | 66.688 | 1969 | 66.2 | 1968 | 65.883 | 1967 | 65.553 | 1966 | 65.171 | 1965 | 64.555 | 1964 | 63.948 | 1963 | 63.274 | 1962 | 62.511 | 1961 | 61.856 | 1960 | 61.037 |
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