Year | Value | 2021 | 68.416 | 2020 | 68.337 | 2019 | 68.265 | 2018 | 68.149 | 2017 | 68.065 | 2016 | 67.991 | 2015 | 67.925 | 2014 | 67.844 | 2013 | 67.79 | 2012 | 67.709 | 2011 | 67.63 | 2010 | 67.567 | 2009 | 67.277 | 2008 | 67.382 | 2007 | 67.233 | 2006 | 67.013 | 2005 | 66.836 | 2004 | 66.625 | 2003 | 66.388 | 2002 | 66.176 | 2001 | 65.924 | 2000 | 65.7 | 1999 | 65.486 | 1998 | 65.288 | 1997 | 65.135 | 1996 | 64.92 | 1995 | 64.74 | 1994 | 64.569 | 1993 | 64.39 | 1992 | 64.208 | 1991 | 64.033 | 1990 | 63.835 | 1989 | 63.688 | 1988 | 63.533 | 1987 | 63.39 | 1986 | 63.257 | 1985 | 63.136 | 1984 | 62.973 | 1983 | 62.855 | 1982 | 62.616 | 1981 | 62.645 | 1980 | 62.465 | 1979 | 62.274 | 1978 | 62.058 | 1977 | 61.764 | 1976 | 61.606 | 1975 | 61.334 | 1974 | 61.08 | 1973 | 60.775 | 1972 | 60.549 | 1971 | 60.316 | 1970 | 60.004 | 1969 | 59.621 | 1968 | 59.157 | 1967 | 58.725 | 1966 | 58.287 | 1965 | 57.846 | 1964 | 57.43 | 1963 | 57.01 | 1962 | 56.602 | 1961 | 56.198 | 1960 | 55.866 |
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