Year | Value | 2022 | 68.93 | 2021 | 68.785 | 2020 | 68.657 | 2019 | 68.543 | 2018 | 68.445 | 2017 | 68.363 | 2016 | 68.297 | 2015 | 68.23 | 2014 | 68.163 | 2013 | 68.097 | 2012 | 68.03 | 2011 | 67.963 | 2010 | 67.567 | 2009 | 66.58 | 2008 | 65.581 | 2007 | 64.564 | 2006 | 63.535 | 2005 | 62.494 | 2004 | 61.443 | 2003 | 60.378 | 2002 | 59.304 | 2001 | 58.222 | 2000 | 57.133 | 1999 | 56.623 | 1998 | 56.669 | 1997 | 56.714 | 1996 | 56.76 | 1995 | 56.805 | 1994 | 56.851 | 1993 | 56.896 | 1992 | 56.942 | 1991 | 56.987 | 1990 | 57.033 | 1989 | 57.078 | 1988 | 56.8 | 1987 | 56.215 | 1986 | 55.628 | 1985 | 55.04 | 1984 | 54.452 | 1983 | 53.86 | 1982 | 53.268 | 1981 | 52.676 | 1980 | 52.083 | 1979 | 51.488 | 1978 | 50.827 | 1977 | 50.103 | 1976 | 49.381 | 1975 | 48.656 | 1974 | 47.933 | 1973 | 47.211 | 1972 | 46.491 | 1971 | 45.77 | 1970 | 45.052 | 1969 | 44.336 | 1968 | 43.717 | 1967 | 43.181 | 1966 | 42.647 | 1965 | 42.114 | 1964 | 41.585 | 1963 | 41.056 | 1962 | 39.73 | 1961 | 37.682 | 1960 | 35.679 |
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