Year | Value | 2021 | 66.078 | 2020 | 66.432 | 2019 | 68.009 | 2018 | 67.352 | 2017 | 66.908 | 2016 | 66.762 | 2015 | 66.834 | 2014 | 66.993 | 2013 | 67.146 | 2012 | 67.26 | 2011 | 67.289 | 2010 | 67.245 | 2009 | 66.957 | 2008 | 66.705 | 2007 | 66.332 | 2006 | 65.965 | 2005 | 65.642 | 2004 | 65.574 | 2003 | 65.468 | 2002 | 65.628 | 2001 | 65.159 | 2000 | 65.35 | 1999 | 64.832 | 1998 | 63.916 | 1997 | 63.149 | 1996 | 62.207 | 1995 | 61.355 | 1994 | 60.789 | 1993 | 60.175 | 1992 | 59.634 | 1991 | 58.731 | 1990 | 57.017 | 1989 | 52.864 | 1988 | 56.436 | 1987 | 54.005 | 1986 | 51.848 | 1985 | 50.876 | 1984 | 47.952 | 1983 | 44.427 | 1982 | 43.786 | 1981 | 39.578 | 1980 | 41.162 | 1979 | 46.063 | 1978 | 47.913 | 1977 | 49.516 | 1976 | 50.891 | 1975 | 51.744 | 1974 | 51.915 | 1973 | 51.465 | 1972 | 50.349 | 1971 | 49.657 | 1970 | 48.77 | 1969 | 48.248 | 1968 | 48.193 | 1967 | 48.402 | 1966 | 48.676 | 1965 | 48.775 | 1964 | 48.71 | 1963 | 48.274 | 1962 | 47.624 | 1961 | 46.866 | 1960 | 46.107 |
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