Year | Value | 2021 | 72.212 | 2020 | 72.208 | 2019 | 72.129 | 2018 | 72.06 | 2017 | 72.005 | 2016 | 71.969 | 2015 | 72.219 | 2014 | 72.207 | 2013 | 72.514 | 2012 | 72.385 | 2011 | 72.692 | 2010 | 72.504 | 2009 | 72.395 | 2008 | 72.099 | 2007 | 71.474 | 2006 | 70.859 | 2005 | 70.72 | 2004 | 69.508 | 2003 | 70.664 | 2002 | 70.911 | 2001 | 70.844 | 2000 | 70.463 | 1999 | 70.362 | 1998 | 70.136 | 1997 | 69.893 | 1996 | 69.633 | 1995 | 69.401 | 1994 | 69.146 | 1993 | 68.984 | 1992 | 68.686 | 1991 | 68.321 | 1990 | 68.015 | 1989 | 67.734 | 1988 | 67.448 | 1987 | 67.224 | 1986 | 66.897 | 1985 | 66.837 | 1984 | 66.592 | 1983 | 58.115 | 1982 | 66.098 | 1981 | 65.85 | 1980 | 65.683 | 1979 | 65.502 | 1978 | 65.277 | 1977 | 65.097 | 1976 | 65.651 | 1975 | 65.615 | 1974 | 65.206 | 1973 | 64.844 | 1972 | 64.413 | 1971 | 64.1 | 1970 | 63.798 | 1969 | 63.481 | 1968 | 63.159 | 1967 | 62.271 | 1966 | 62.432 | 1965 | 62.172 | 1964 | 62.434 | 1963 | 61.844 | 1962 | 60.669 | 1961 | 59.581 | 1960 | 58.608 |
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