Year | Value | 2021 | 72.83 | 2020 | 74.769 | 2019 | 76.752 | 2018 | 76.748 | 2017 | 76.646 | 2016 | 76.471 | 2015 | 76.257 | 2014 | 76.043 | 2013 | 75.827 | 2012 | 75.597 | 2011 | 75.32 | 2010 | 75.033 | 2009 | 74.742 | 2008 | 74.295 | 2007 | 73.837 | 2006 | 73.468 | 2005 | 73.081 | 2004 | 72.695 | 2003 | 72.361 | 2002 | 71.939 | 2001 | 71.502 | 2000 | 71.32 | 1999 | 70.926 | 1998 | 70.738 | 1997 | 70.492 | 1996 | 70.189 | 1995 | 69.933 | 1994 | 69.613 | 1993 | 69.342 | 1992 | 69.038 | 1991 | 68.813 | 1990 | 68.644 | 1989 | 68.533 | 1988 | 68.391 | 1987 | 68.268 | 1986 | 68.26 | 1985 | 66.276 | 1984 | 67.979 | 1983 | 67.745 | 1982 | 67.531 | 1981 | 67.197 | 1980 | 66.868 | 1979 | 66.38 | 1978 | 65.954 | 1977 | 65.424 | 1976 | 64.845 | 1975 | 64.27 | 1974 | 63.64 | 1973 | 63.06 | 1972 | 62.569 | 1971 | 62.051 | 1970 | 61.569 | 1969 | 61.216 | 1968 | 60.871 | 1967 | 60.531 | 1966 | 60.204 | 1965 | 59.815 | 1964 | 59.375 | 1963 | 58.892 | 1962 | 58.301 | 1961 | 57.73 | 1960 | 57.13 |
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