Year | Value | 2021 | 68.655 | 2020 | 69.337 | 2019 | 69.309 | 2018 | 69.115 | 2017 | 68.53 | 2016 | 68.3 | 2015 | 67.981 | 2014 | 67.588 | 2013 | 66.896 | 2012 | 66.658 | 2011 | 66.33 | 2010 | 65.547 | 2009 | 65.081 | 2008 | 64.188 | 2007 | 63.784 | 2006 | 63.272 | 2005 | 62.375 | 2004 | 61.54 | 2003 | 61.15 | 2002 | 60.449 | 2001 | 59.989 | 2000 | 58.383 | 1999 | 54.192 | 1998 | 57.483 | 1997 | 57.808 | 1996 | 57.152 | 1995 | 56.192 | 1994 | 55.454 | 1993 | 54.539 | 1992 | 53.855 | 1991 | 52.753 | 1990 | 51.873 | 1989 | 50.507 | 1988 | 50.551 | 1987 | 49.932 | 1986 | 49.325 | 1985 | 48.847 | 1984 | 48.407 | 1983 | 47.944 | 1982 | 47.604 | 1981 | 47.22 | 1980 | 47.01 | 1979 | 46.869 | 1978 | 46.483 | 1977 | 46.28 | 1976 | 45.664 | 1975 | 45.189 | 1974 | 44.661 | 1973 | 44.168 | 1972 | 43.785 | 1971 | 43.44 | 1970 | 43.081 | 1969 | 42.678 | 1968 | 42.461 | 1967 | 42.177 | 1966 | 41.9 | 1965 | 41.587 | 1964 | 41.336 | 1963 | 40.879 | 1962 | 40.525 | 1961 | 40.079 | 1960 | 39.649 |
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