Year | Value | 2021 | 73.39 | 2020 | 72.789 | 2019 | 73.883 | 2018 | 73.815 | 2017 | 73.773 | 2016 | 73.505 | 2015 | 73.324 | 2014 | 73.13 | 2013 | 72.841 | 2012 | 72.47 | 2011 | 72.225 | 2010 | 71.813 | 2009 | 71.572 | 2008 | 71.445 | 2007 | 71.034 | 2006 | 70.585 | 2005 | 70.301 | 2004 | 70.548 | 2003 | 70.067 | 2002 | 69.601 | 2001 | 69.126 | 2000 | 68.76 | 1999 | 68.438 | 1998 | 68.103 | 1997 | 67.856 | 1996 | 67.764 | 1995 | 67.691 | 1994 | 67.621 | 1993 | 67.734 | 1992 | 68.036 | 1991 | 68.109 | 1990 | 68.308 | 1989 | 68.317 | 1988 | 68.173 | 1987 | 68.002 | 1986 | 67.701 | 1985 | 67.336 | 1984 | 67.046 | 1983 | 66.826 | 1982 | 66.609 | 1981 | 66.413 | 1980 | 66.169 | 1979 | 65.996 | 1978 | 65.815 | 1977 | 65.578 | 1976 | 65.701 | 1975 | 65.175 | 1974 | 65.066 | 1973 | 64.61 | 1972 | 64.727 | 1971 | 64.391 | 1970 | 63.969 | 1969 | 63.825 | 1968 | 63.173 | 1967 | 62.758 | 1966 | 62.338 | 1965 | 61.996 | 1964 | 61.84 | 1963 | 61.378 | 1962 | 60.964 | 1961 | 60.589 | 1960 | 60.302 |
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