Year | Value | 2021 | 74.608 | 2020 | 74.54 | 2019 | 74.842 | 2018 | 74.955 | 2017 | 74.973 | 2016 | 74.979 | 2015 | 74.764 | 2014 | 74.867 | 2013 | 74.76 | 2012 | 74.664 | 2011 | 74.545 | 2010 | 74.422 | 2009 | 74.267 | 2008 | 74.253 | 2007 | 73.953 | 2006 | 73.937 | 2005 | 73.884 | 2004 | 73.785 | 2003 | 73.739 | 2002 | 72.093 | 2001 | 73.473 | 2000 | 72.811 | 1999 | 72.859 | 1998 | 72.696 | 1997 | 72.533 | 1996 | 72.065 | 1995 | 71.981 | 1994 | 71.542 | 1993 | 71.457 | 1992 | 71.328 | 1991 | 70.961 | 1990 | 70.776 | 1989 | 70.559 | 1988 | 70.32 | 1987 | 69.696 | 1986 | 69.638 | 1985 | 69.417 | 1984 | 69.323 | 1983 | 68.782 | 1982 | 68.548 | 1981 | 68.074 | 1980 | 67.901 | 1979 | 67.495 | 1978 | 67.331 | 1977 | 66.906 | 1976 | 66.451 | 1975 | 66.043 | 1974 | 65.613 | 1973 | 65.07 | 1972 | 64.546 | 1971 | 64.333 | 1970 | 63.76 | 1969 | 63.176 | 1968 | 62.611 | 1967 | 62.426 | 1966 | 61.764 | 1965 | 61.524 | 1964 | 60.847 | 1963 | 60.626 | 1962 | 60.048 | 1961 | 59.338 | 1960 | 58.621 |
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