Year | Value | 2021 | 72.663 | 2020 | 71.984 | 2019 | 72.464 | 2018 | 72.192 | 2017 | 72.227 | 2016 | 71.995 | 2015 | 72.166 | 2014 | 72.014 | 2013 | 71.971 | 2012 | 71.914 | 2011 | 71.888 | 2010 | 71.636 | 2009 | 71.325 | 2008 | 70.816 | 2007 | 70.469 | 2006 | 70.159 | 2005 | 69.636 | 2004 | 69.806 | 2003 | 69.371 | 2002 | 68.972 | 2001 | 68.79 | 2000 | 68.781 | 1999 | 68.292 | 1998 | 67.802 | 1997 | 67.328 | 1996 | 67.21 | 1995 | 67.39 | 1994 | 67.327 | 1993 | 67.306 | 1992 | 67.328 | 1991 | 67.343 | 1990 | 67.213 | 1989 | 66.93 | 1988 | 66.853 | 1987 | 66.42 | 1986 | 66.126 | 1985 | 65.702 | 1984 | 65.596 | 1983 | 65.107 | 1982 | 65.002 | 1981 | 64.79 | 1980 | 64.359 | 1979 | 63.935 | 1978 | 63.555 | 1977 | 63.154 | 1976 | 62.93 | 1975 | 63.06 | 1974 | 62.705 | 1973 | 62.307 | 1972 | 61.937 | 1971 | 61.5 | 1970 | 61.252 | 1969 | 60.764 | 1968 | 60.307 | 1967 | 60.16 | 1966 | 59.668 | 1965 | 59.274 | 1964 | 59.004 | 1963 | 58.594 | 1962 | 58.183 | 1961 | 57.83 | 1960 | 57.415 |
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