Year | Value | 2021 | 75.629 | 2020 | 75.418 | 2019 | 75.23 | 2018 | 75.013 | 2017 | 74.863 | 2016 | 74.737 | 2015 | 74.54 | 2014 | 74.342 | 2013 | 74.163 | 2012 | 73.989 | 2011 | 73.785 | 2010 | 73.567 | 2009 | 73.357 | 2008 | 73.137 | 2007 | 73.002 | 2006 | 72.751 | 2005 | 72.652 | 2004 | 72.433 | 2003 | 72.091 | 2002 | 72.065 | 2001 | 71.881 | 2000 | 71.63 | 1999 | 71.418 | 1998 | 71.006 | 1997 | 70.787 | 1996 | 70.772 | 1995 | 70.526 | 1994 | 70.364 | 1993 | 70.387 | 1992 | 70.278 | 1991 | 70.219 | 1990 | 70.165 | 1989 | 70.12 | 1988 | 70.076 | 1987 | 70.184 | 1986 | 70.093 | 1985 | 70.143 | 1984 | 70.122 | 1983 | 70.115 | 1982 | 69.98 | 1981 | 69.736 | 1980 | 69.404 | 1979 | 69.173 | 1978 | 68.813 | 1977 | 68.366 | 1976 | 67.94 | 1975 | 67.605 | 1974 | 67.183 | 1973 | 66.745 | 1972 | 66.518 | 1971 | 66.153 | 1970 | 65.891 | 1969 | 65.931 | 1968 | 65.735 | 1967 | 65.435 | 1966 | 65.298 | 1965 | 64.919 | 1964 | 64.548 | 1963 | 64.019 | 1962 | 63.543 | 1961 | 62.971 | 1960 | 62.302 |
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