Year | Value | 2021 | 74.642 | 2020 | 74.795 | 2019 | 74.748 | 2018 | 74.712 | 2017 | 74.722 | 2016 | 74.733 | 2015 | 74.75 | 2014 | 74.779 | 2013 | 74.799 | 2012 | 74.827 | 2011 | 74.858 | 2010 | 74.849 | 2009 | 74.846 | 2008 | 74.84 | 2007 | 74.818 | 2006 | 74.783 | 2005 | 74.731 | 2004 | 74.65 | 2003 | 74.561 | 2002 | 74.426 | 2001 | 74.276 | 2000 | 74.08 | 1999 | 73.863 | 1998 | 73.619 | 1997 | 73.364 | 1996 | 73.1 | 1995 | 72.816 | 1994 | 72.553 | 1993 | 72.312 | 1992 | 72.081 | 1991 | 71.871 | 1990 | 71.656 | 1989 | 71.445 | 1988 | 71.236 | 1987 | 71.019 | 1986 | 70.847 | 1985 | 70.582 | 1984 | 70.358 | 1983 | 70.09 | 1982 | 69.841 | 1981 | 69.54 | 1980 | 69.246 | 1979 | 68.862 | 1978 | 68.487 | 1977 | 68.075 | 1976 | 67.608 | 1975 | 67.107 | 1974 | 66.528 | 1973 | 65.963 | 1972 | 65.35 | 1971 | 64.699 | 1970 | 64.11 | 1969 | 63.553 | 1968 | 63.005 | 1967 | 62.511 | 1966 | 61.963 | 1965 | 61.193 | 1964 | 60.582 | 1963 | 59.779 | 1962 | 57.667 | 1961 | 57.817 | 1960 | 56.793 |
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