Year | Value | 2021 | 67.417 | 2020 | 67.266 | 2019 | 67.15 | 2018 | 66.855 | 2017 | 66.597 | 2016 | 66.332 | 2015 | 66.059 | 2014 | 65.815 | 2013 | 65.588 | 2012 | 65.378 | 2011 | 65.19 | 2010 | 65.016 | 2009 | 64.892 | 2008 | 64.834 | 2007 | 64.844 | 2006 | 64.906 | 2005 | 64.967 | 2004 | 64.989 | 2003 | 64.954 | 2002 | 64.84 | 2001 | 64.655 | 2000 | 64.409 | 1999 | 64.136 | 1998 | 63.854 | 1997 | 63.575 | 1996 | 63.291 | 1995 | 63.014 | 1994 | 62.697 | 1993 | 62.321 | 1992 | 61.893 | 1991 | 61.422 | 1990 | 60.917 | 1989 | 60.408 | 1988 | 59.904 | 1987 | 59.412 | 1986 | 58.97 | 1985 | 58.591 | 1984 | 58.266 | 1983 | 57.985 | 1982 | 57.718 | 1981 | 57.495 | 1980 | 57.286 | 1979 | 57.083 | 1978 | 56.91 | 1977 | 56.032 | 1976 | 56.628 | 1975 | 56.471 | 1974 | 56.266 | 1973 | 55.971 | 1972 | 55.476 | 1971 | 55.097 | 1970 | 54.527 | 1969 | 53.88 | 1968 | 53.22 | 1967 | 52.524 | 1966 | 51.779 | 1965 | 51.038 | 1964 | 50.323 | 1963 | 49.624 | 1962 | 48.96 | 1961 | 48.381 | 1960 | 47.873 |
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