Year | Value | 2021 | 71.482 | 2020 | 73.997 | 2019 | 73.742 | 2018 | 73.556 | 2017 | 73.35 | 2016 | 73.179 | 2015 | 73.016 | 2014 | 72.86 | 2013 | 72.472 | 2012 | 72.537 | 2011 | 72.431 | 2010 | 72.418 | 2009 | 72.301 | 2008 | 72.238 | 2007 | 72.175 | 2006 | 71.959 | 2005 | 71.957 | 2004 | 71.752 | 2003 | 71.693 | 2002 | 71.549 | 2001 | 71.409 | 2000 | 71.244 | 1999 | 71.119 | 1998 | 70.913 | 1997 | 70.691 | 1996 | 70.388 | 1995 | 69.946 | 1994 | 69.719 | 1993 | 69.371 | 1992 | 68.974 | 1991 | 68.166 | 1990 | 67.759 | 1989 | 67.289 | 1988 | 66.74 | 1987 | 66.224 | 1986 | 65.69 | 1985 | 65.364 | 1984 | 64.921 | 1983 | 64.834 | 1982 | 64.63 | 1981 | 64.421 | 1980 | 64.362 | 1979 | 64.214 | 1978 | 64.079 | 1977 | 64.027 | 1976 | 63.494 | 1975 | 63.711 | 1974 | 63.683 | 1973 | 63.633 | 1972 | 63.724 | 1971 | 63.816 | 1970 | 63.465 | 1969 | 63.599 | 1968 | 63.389 | 1967 | 63.177 | 1966 | 62.91 | 1965 | 62.587 | 1964 | 62.208 | 1963 | 62.064 | 1962 | 61.625 | 1961 | 61.293 | 1960 | 60.893 |
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