Year | Value | 2021 | 69.589 | 2020 | 70.333 | 2019 | 71.57 | 2018 | 71.344 | 2017 | 72.176 | 2016 | 71.239 | 2015 | 70.082 | 2014 | 70.707 | 2013 | 70.543 | 2012 | 70.596 | 2011 | 69.762 | 2010 | 69.004 | 2009 | 68.487 | 2008 | 68.478 | 2007 | 68.315 | 2006 | 68.065 | 2005 | 68.753 | 2004 | 67.829 | 2003 | 67.556 | 2002 | 66.965 | 2001 | 66.35 | 2000 | 64.96 | 1999 | 64.525 | 1998 | 64.122 | 1997 | 63.401 | 1996 | 63.097 | 1995 | 61.635 | 1994 | 63.021 | 1993 | 63.211 | 1992 | 63.354 | 1991 | 63.215 | 1990 | 63.168 | 1989 | 62.818 | 1988 | 62.54 | 1987 | 62.071 | 1986 | 61.545 | 1985 | 61.143 | 1984 | 60.555 | 1983 | 60.846 | 1982 | 61.028 | 1981 | 61.042 | 1980 | 61.079 | 1979 | 60.432 | 1978 | 59.795 | 1977 | 58.916 | 1976 | 57.902 | 1975 | 56.971 | 1974 | 55.624 | 1973 | 54.703 | 1972 | 54.037 | 1971 | 53.79 | 1970 | 53.631 | 1969 | 53.17 | 1968 | 52.567 | 1967 | 52.138 | 1966 | 51.759 | 1965 | 50.917 | 1964 | 50.199 | 1963 | 49.487 | 1962 | 48.663 | 1961 | 47.92 | 1960 | 47.118 |
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