Year | Value | 2021 | 74.936 | 2020 | 74.924 | 2019 | 74.863 | 2018 | 74.808 | 2017 | 74.765 | 2016 | 74.762 | 2015 | 75.013 | 2014 | 74.985 | 2013 | 75.116 | 2012 | 75.042 | 2011 | 75.295 | 2010 | 74.999 | 2009 | 75.036 | 2008 | 74.656 | 2007 | 74.317 | 2006 | 73.7 | 2005 | 73.521 | 2004 | 71.788 | 2003 | 73.188 | 2002 | 73.167 | 2001 | 73.118 | 2000 | 72.783 | 1999 | 72.903 | 1998 | 72.805 | 1997 | 72.568 | 1996 | 72.331 | 1995 | 72.109 | 1994 | 71.786 | 1993 | 71.576 | 1992 | 71.291 | 1991 | 70.974 | 1990 | 70.683 | 1989 | 70.419 | 1988 | 70.165 | 1987 | 69.939 | 1986 | 69.77 | 1985 | 69.58 | 1984 | 69.32 | 1983 | 64.219 | 1982 | 68.712 | 1981 | 68.45 | 1980 | 68.144 | 1979 | 67.9 | 1978 | 67.668 | 1977 | 67.475 | 1976 | 68.151 | 1975 | 67.971 | 1974 | 67.583 | 1973 | 67.217 | 1972 | 66.822 | 1971 | 66.479 | 1970 | 66.216 | 1969 | 65.857 | 1968 | 65.498 | 1967 | 64.654 | 1966 | 64.655 | 1965 | 64.728 | 1964 | 64.841 | 1963 | 64.077 | 1962 | 62.877 | 1961 | 61.792 | 1960 | 60.76 |
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