Year | Value | 2021 | 8.326 | 2020 | 7.42 | 2019 | 6.572 | 2018 | 6.516 | 2017 | 6.493 | 2016 | 6.538 | 2015 | 6.433 | 2014 | 6.272 | 2013 | 6.31 | 2012 | 6.34 | 2011 | 6.283 | 2010 | 6.199 | 2009 | 6.155 | 2008 | 6.106 | 2007 | 6.119 | 2006 | 6.123 | 2005 | 6.106 | 2004 | 6.258 | 2003 | 6.313 | 2002 | 6.329 | 2001 | 6.303 | 2000 | 6.399 | 1999 | 6.386 | 1998 | 6.429 | 1997 | 6.488 | 1996 | 6.564 | 1995 | 6.685 | 1994 | 6.74 | 1993 | 6.855 | 1992 | 6.951 | 1991 | 7.068 | 1990 | 7.158 | 1989 | 7.165 | 1988 | 7.31 | 1987 | 7.447 | 1986 | 7.615 | 1985 | 7.796 | 1984 | 7.97 | 1983 | 8.153 | 1982 | 8.346 | 1981 | 8.558 | 1980 | 8.779 | 1979 | 8.989 | 1978 | 9.203 | 1977 | 9.392 | 1976 | 9.568 | 1975 | 9.744 | 1974 | 9.954 | 1973 | 10.157 | 1972 | 10.367 | 1971 | 10.595 | 1970 | 10.82 | 1969 | 11.062 | 1968 | 11.341 | 1967 | 11.66 | 1966 | 11.968 | 1965 | 12.279 | 1964 | 12.621 | 1963 | 12.952 | 1962 | 13.301 | 1961 | 13.662 | 1960 | 14.025 |
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