Year | Value | 2021 | 68.45 | 2020 | 69.246 | 2019 | 69.558 | 2018 | 68.979 | 2017 | 68.91 | 2016 | 68.776 | 2015 | 67.456 | 2014 | 68.085 | 2013 | 67.965 | 2012 | 67.47 | 2011 | 67.313 | 2010 | 66.814 | 2009 | 66.761 | 2008 | 66.421 | 2007 | 66.329 | 2006 | 65.868 | 2005 | 65.457 | 2004 | 64.818 | 2003 | 64.197 | 2002 | 63.264 | 2001 | 63.336 | 2000 | 62.614 | 1999 | 62.113 | 1998 | 61.549 | 1997 | 60.771 | 1996 | 59.981 | 1995 | 59.318 | 1994 | 58.553 | 1993 | 57.619 | 1992 | 56.71 | 1991 | 55.712 | 1990 | 54.833 | 1989 | 54.127 | 1988 | 53.071 | 1987 | 52.475 | 1986 | 51.535 | 1985 | 50.882 | 1984 | 50.225 | 1983 | 49.431 | 1982 | 48.936 | 1981 | 48.387 | 1980 | 47.889 | 1979 | 47.266 | 1978 | 46.682 | 1977 | 46.005 | 1976 | 45.544 | 1975 | 45.04 | 1974 | 44.464 | 1973 | 44.044 | 1972 | 43.689 | 1971 | 43.312 | 1970 | 42.827 | 1969 | 42.334 | 1968 | 41.802 | 1967 | 41.404 | 1966 | 40.866 | 1965 | 40.446 | 1964 | 39.994 | 1963 | 39.453 | 1962 | 39.153 | 1961 | 38.855 | 1960 | 38.559 |
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