Year | Value | 2021 | 69.117 | 2020 | 70.787 | 2019 | 69.369 | 2018 | 69.245 | 2017 | 69.26 | 2016 | 69.18 | 2015 | 69.144 | 2014 | 69.149 | 2013 | 69.094 | 2012 | 69.007 | 2011 | 68.984 | 2010 | 68.784 | 2009 | 68.751 | 2008 | 68.613 | 2007 | 68.67 | 2006 | 68.579 | 2005 | 68.543 | 2004 | 68.348 | 2003 | 68.228 | 2002 | 68.075 | 2001 | 67.952 | 2000 | 67.773 | 1999 | 67.589 | 1998 | 67.427 | 1997 | 67.194 | 1996 | 66.696 | 1995 | 66.553 | 1994 | 65.982 | 1993 | 65.879 | 1992 | 65.358 | 1991 | 65.285 | 1990 | 64.762 | 1989 | 64.661 | 1988 | 64.195 | 1987 | 64.212 | 1986 | 63.653 | 1985 | 63.549 | 1984 | 63.063 | 1983 | 62.907 | 1982 | 62.868 | 1981 | 62.632 | 1980 | 61.982 | 1979 | 61.755 | 1978 | 61.132 | 1977 | 60.826 | 1976 | 60.558 | 1975 | 58.151 | 1974 | 49.854 | 1973 | 51.163 | 1972 | 46.984 | 1971 | 51.135 | 1970 | 50.584 | 1969 | 50.557 | 1968 | 48.21 | 1967 | 53.225 | 1966 | 53.655 | 1965 | 54.007 | 1964 | 54.918 | 1963 | 54.259 | 1962 | 56.052 | 1961 | 56.447 | 1960 | 55.931 |
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