Year | Value | 2021 | 69.264 | 2020 | 68.687 | 2019 | 69.002 | 2018 | 68.796 | 2017 | 68.916 | 2016 | 68.777 | 2015 | 68.782 | 2014 | 68.614 | 2013 | 68.74 | 2012 | 68.722 | 2011 | 68.567 | 2010 | 68.293 | 2009 | 67.958 | 2008 | 67.407 | 2007 | 66.895 | 2006 | 66.499 | 2005 | 66.068 | 2004 | 66.075 | 2003 | 65.746 | 2002 | 65.385 | 2001 | 65.156 | 2000 | 65.026 | 1999 | 64.518 | 1998 | 64.106 | 1997 | 63.646 | 1996 | 63.596 | 1995 | 63.684 | 1994 | 63.756 | 1993 | 63.804 | 1992 | 63.875 | 1991 | 64.035 | 1990 | 63.939 | 1989 | 63.787 | 1988 | 63.682 | 1987 | 63.352 | 1986 | 62.976 | 1985 | 62.475 | 1984 | 62.256 | 1983 | 61.846 | 1982 | 61.603 | 1981 | 61.452 | 1980 | 61.022 | 1979 | 60.601 | 1978 | 60.265 | 1977 | 59.877 | 1976 | 59.668 | 1975 | 59.525 | 1974 | 59.256 | 1973 | 58.832 | 1972 | 58.425 | 1971 | 58.038 | 1970 | 57.663 | 1969 | 57.173 | 1968 | 56.694 | 1967 | 56.39 | 1966 | 55.92 | 1965 | 55.522 | 1964 | 55.177 | 1963 | 54.785 | 1962 | 54.325 | 1961 | 53.939 | 1960 | 53.469 |
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