Year | Value | 2021 | 71.682 | 2020 | 71.627 | 2019 | 71.572 | 2018 | 71.467 | 2017 | 71.84 | 2016 | 71.74 | 2015 | 70.763 | 2014 | 70.966 | 2013 | 71.457 | 2012 | 71.669 | 2011 | 71.538 | 2010 | 71.27 | 2009 | 71.393 | 2008 | 71.374 | 2007 | 71.367 | 2006 | 71.288 | 2005 | 71.362 | 2004 | 71.303 | 2003 | 70.768 | 2002 | 70.452 | 2001 | 70.2 | 2000 | 69.781 | 1999 | 68.709 | 1998 | 67.69 | 1997 | 67.853 | 1996 | 67.313 | 1995 | 67.152 | 1994 | 67.294 | 1993 | 67.58 | 1992 | 66.972 | 1991 | 66.15 | 1990 | 65.188 | 1989 | 64.992 | 1988 | 65.45 | 1987 | 65.476 | 1986 | 65.511 | 1985 | 65.795 | 1984 | 65.278 | 1983 | 64.634 | 1982 | 64.279 | 1981 | 63.879 | 1980 | 63.358 | 1979 | 63.233 | 1978 | 63.352 | 1977 | 63.781 | 1976 | 63.682 | 1975 | 63.098 | 1974 | 61.722 | 1973 | 60.275 | 1972 | 60.187 | 1971 | 60.747 | 1970 | 61.291 | 1969 | 60.824 | 1968 | 60.795 | 1967 | 60.504 | 1966 | 60.022 | 1965 | 59.593 | 1964 | 59.037 | 1963 | 58.608 | 1962 | 57.183 | 1961 | 55.818 | 1960 | 55.909 |
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