Year | Value | 2021 | 9.274 | 2020 | 9.529 | 2019 | 9.205 | 2018 | 9.419 | 2017 | 9.637 | 2016 | 9.927 | 2015 | 10.211 | 2014 | 10.548 | 2013 | 10.936 | 2012 | 11.21 | 2011 | 11.498 | 2010 | 11.812 | 2009 | 12.189 | 2008 | 12.609 | 2007 | 12.929 | 2006 | 13.233 | 2005 | 13.669 | 2004 | 14.006 | 2003 | 14.435 | 2002 | 14.888 | 2001 | 15.487 | 2000 | 15.984 | 1999 | 16.482 | 1998 | 16.907 | 1997 | 17.36 | 1996 | 17.913 | 1995 | 18.015 | 1994 | 18.189 | 1993 | 18.282 | 1992 | 18.533 | 1991 | 18.794 | 1990 | 19.272 | 1989 | 19.917 | 1988 | 20.368 | 1987 | 20.96 | 1986 | 21.589 | 1985 | 22.264 | 1984 | 22.761 | 1983 | 23.317 | 1982 | 23.684 | 1981 | 24.258 | 1980 | 24.673 | 1979 | 25.338 | 1978 | 26.076 | 1977 | 26.907 | 1976 | 27.708 | 1975 | 28.595 | 1974 | 29.331 | 1973 | 30.156 | 1972 | 30.844 | 1971 | 31.793 | 1970 | 32.203 | 1969 | 32.713 | 1968 | 33.142 | 1967 | 33.551 | 1966 | 33.869 | 1965 | 34.091 | 1964 | 34.277 | 1963 | 34.566 | 1962 | 34.804 | 1961 | 34.912 | 1960 | 34.973 |
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