Year | Value | 2021 | 5.922 | 2020 | 5.584 | 2019 | 5.409 | 2018 | 5.579 | 2017 | 5.721 | 2016 | 5.84 | 2015 | 6.109 | 2014 | 6.318 | 2013 | 6.503 | 2012 | 6.78 | 2011 | 6.894 | 2010 | 7.19 | 2009 | 7.514 | 2008 | 7.831 | 2007 | 8.178 | 2006 | 8.577 | 2005 | 8.99 | 2004 | 9.444 | 2003 | 9.932 | 2002 | 10.423 | 2001 | 10.815 | 2000 | 11.181 | 1999 | 11.39 | 1998 | 11.488 | 1997 | 11.417 | 1996 | 11.395 | 1995 | 11.326 | 1994 | 11.287 | 1993 | 11.291 | 1992 | 11.258 | 1991 | 11.285 | 1990 | 11.433 | 1989 | 11.756 | 1988 | 12.208 | 1987 | 12.857 | 1986 | 13.487 | 1985 | 14.298 | 1984 | 14.861 | 1983 | 15.484 | 1982 | 15.939 | 1981 | 16.466 | 1980 | 16.998 | 1979 | 17.696 | 1978 | 18.454 | 1977 | 19.241 | 1976 | 20.042 | 1975 | 20.821 | 1974 | 21.545 | 1973 | 22.112 | 1972 | 22.793 | 1971 | 23.266 | 1970 | 23.627 | 1969 | 23.971 | 1968 | 24.179 | 1967 | 24.39 | 1966 | 24.544 | 1965 | 24.702 | 1964 | 24.722 | 1963 | 24.787 | 1962 | 24.866 | 1961 | 24.863 | 1960 | 24.944 |
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