Year | Value | 2021 | 70.862 | 2020 | 70.331 | 2019 | 71.344 | 2018 | 71.149 | 2017 | 71.01 | 2016 | 70.755 | 2015 | 70.475 | 2014 | 70.234 | 2013 | 69.99 | 2012 | 69.874 | 2011 | 69.649 | 2010 | 69.235 | 2009 | 68.871 | 2008 | 68.765 | 2007 | 68.292 | 2006 | 67.891 | 2005 | 67.49 | 2004 | 67.401 | 2003 | 67.04 | 2002 | 66.604 | 2001 | 66.087 | 2000 | 65.724 | 1999 | 65.383 | 1998 | 65.035 | 1997 | 64.764 | 1996 | 64.712 | 1995 | 64.646 | 1994 | 64.685 | 1993 | 64.829 | 1992 | 65.109 | 1991 | 65.131 | 1990 | 65.346 | 1989 | 65.281 | 1988 | 65.147 | 1987 | 64.984 | 1986 | 64.723 | 1985 | 64.287 | 1984 | 64.002 | 1983 | 63.805 | 1982 | 63.563 | 1981 | 63.304 | 1980 | 63.036 | 1979 | 62.688 | 1978 | 62.563 | 1977 | 62.329 | 1976 | 62.506 | 1975 | 62.181 | 1974 | 62.006 | 1973 | 61.676 | 1972 | 61.627 | 1971 | 61.325 | 1970 | 60.934 | 1969 | 60.716 | 1968 | 60.217 | 1967 | 59.803 | 1966 | 59.464 | 1965 | 59.203 | 1964 | 58.846 | 1963 | 58.44 | 1962 | 58.066 | 1961 | 57.795 | 1960 | 57.473 |
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