Year | Value | 2021 | 66.554 | 2020 | 67.051 | 2019 | 70.403 | 2018 | 69.992 | 2017 | 69.92 | 2016 | 69.673 | 2015 | 69.595 | 2014 | 69.236 | 2013 | 69.062 | 2012 | 69.037 | 2011 | 68.613 | 2010 | 68.597 | 2009 | 68.242 | 2008 | 67.995 | 2007 | 68.08 | 2006 | 67.743 | 2005 | 67.596 | 2004 | 67.494 | 2003 | 67.306 | 2002 | 67.124 | 2001 | 67.073 | 2000 | 66.89 | 1999 | 66.554 | 1998 | 66.785 | 1997 | 66.322 | 1996 | 65.82 | 1995 | 65.445 | 1994 | 65.08 | 1993 | 64.885 | 1992 | 64.747 | 1991 | 65.008 | 1990 | 65.447 | 1989 | 65.293 | 1988 | 53.036 | 1987 | 65.015 | 1986 | 64.838 | 1985 | 64.692 | 1984 | 64.004 | 1983 | 63.544 | 1982 | 63.338 | 1981 | 63.034 | 1980 | 62.729 | 1979 | 62.405 | 1978 | 62.112 | 1977 | 61.79 | 1976 | 61.753 | 1975 | 61.565 | 1974 | 61.326 | 1973 | 61.075 | 1972 | 60.991 | 1971 | 60.754 | 1970 | 60.482 | 1969 | 60.228 | 1968 | 59.954 | 1967 | 60.047 | 1966 | 59.831 | 1965 | 59.548 | 1964 | 59.271 | 1963 | 59.128 | 1962 | 58.849 | 1961 | 58.551 | 1960 | 58.252 |
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