Year | Value | 2021 | 68.469 | 2020 | 69.818 | 2019 | 69.668 | 2018 | 69.695 | 2017 | 69.916 | 2016 | 70.121 | 2015 | 70.798 | 2014 | 71.727 | 2013 | 72.234 | 2012 | 72.01 | 2011 | 71.176 | 2010 | 70.579 | 2009 | 70.114 | 2008 | 69.629 | 2007 | 69.189 | 2006 | 68.684 | 2005 | 68.454 | 2004 | 68.249 | 2003 | 68.429 | 2002 | 68.662 | 2001 | 68.782 | 2000 | 69.082 | 1999 | 69.132 | 1998 | 69.259 | 1997 | 69.627 | 1996 | 69.919 | 1995 | 70.224 | 1994 | 70.47 | 1993 | 70.753 | 1992 | 71.037 | 1991 | 70.941 | 1990 | 71.19 | 1989 | 71.064 | 1988 | 70.605 | 1987 | 70.354 | 1986 | 69.595 | 1985 | 69.355 | 1984 | 69.005 | 1983 | 69.035 | 1982 | 69.031 | 1981 | 68.593 | 1980 | 68.08 | 1979 | 67.784 | 1978 | 67.314 | 1977 | 67.025 | 1976 | 66.701 | 1975 | 66.109 | 1974 | 65.859 | 1973 | 65.506 | 1972 | 65.046 | 1971 | 64.717 | 1970 | 64.627 | 1969 | 64.41 | 1968 | 64.329 | 1967 | 64.655 | 1966 | 64.665 | 1965 | 64.405 | 1964 | 64.138 | 1963 | 63.584 | 1962 | 62.845 | 1961 | 62.673 | 1960 | 62.238 |
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