Year | Value | 2021 | 75.775 | 2020 | 76.061 | 2019 | 75.909 | 2018 | 75.724 | 2017 | 75.52 | 2016 | 75.366 | 2015 | 75.148 | 2014 | 74.908 | 2013 | 74.671 | 2012 | 74.476 | 2011 | 74.244 | 2010 | 73.959 | 2009 | 73.796 | 2008 | 73.509 | 2007 | 73.277 | 2006 | 72.972 | 2005 | 73.07 | 2004 | 73.153 | 2003 | 72.742 | 2002 | 72.48 | 2001 | 71.912 | 2000 | 71.503 | 1999 | 71.368 | 1998 | 71.058 | 1997 | 71.087 | 1996 | 71.047 | 1995 | 70.971 | 1994 | 71.029 | 1993 | 71.028 | 1992 | 70.808 | 1991 | 70.881 | 1990 | 70.899 | 1989 | 70.801 | 1988 | 70.847 | 1987 | 70.819 | 1986 | 70.835 | 1985 | 70.832 | 1984 | 70.783 | 1983 | 70.71 | 1982 | 70.632 | 1981 | 70.543 | 1980 | 70.359 | 1979 | 70.139 | 1978 | 69.968 | 1977 | 69.73 | 1976 | 69.55 | 1975 | 69.006 | 1974 | 68.762 | 1973 | 68.456 | 1972 | 68.004 | 1971 | 67.609 | 1970 | 67.062 | 1969 | 66.581 | 1968 | 65.787 | 1967 | 64.978 | 1966 | 64.113 | 1965 | 63.183 | 1964 | 62.219 | 1963 | 61.404 | 1962 | 60.464 | 1961 | 59.688 | 1960 | 58.904 |
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