Year | Value | 2022 | 32.074 | 2021 | 31.695 | 2020 | 31.32 | 2019 | 30.947 | 2018 | 30.578 | 2017 | 30.212 | 2016 | 29.85 | 2015 | 29.49 | 2014 | 29.133 | 2013 | 28.779 | 2012 | 28.428 | 2011 | 28.079 | 2010 | 27.732 | 2009 | 27.389 | 2008 | 27.048 | 2007 | 26.709 | 2006 | 26.374 | 2005 | 26.041 | 2004 | 25.71 | 2003 | 25.343 | 2002 | 24.979 | 2001 | 24.619 | 2000 | 24.263 | 1999 | 23.91 | 1998 | 23.561 | 1997 | 23.215 | 1996 | 22.873 | 1995 | 22.534 | 1994 | 22.199 | 1993 | 21.867 | 1992 | 21.54 | 1991 | 21.215 | 1990 | 20.842 | 1989 | 20.37 | 1988 | 19.907 | 1987 | 19.451 | 1986 | 19.003 | 1985 | 18.563 | 1984 | 18.132 | 1983 | 17.708 | 1982 | 17.291 | 1981 | 16.883 | 1980 | 16.483 | 1979 | 16.089 | 1978 | 15.704 | 1977 | 15.326 | 1976 | 14.956 | 1975 | 14.593 | 1974 | 14.237 | 1973 | 13.889 | 1972 | 13.548 | 1971 | 13.213 | 1970 | 12.886 | 1969 | 12.566 | 1968 | 12.253 | 1967 | 11.946 | 1966 | 11.646 | 1965 | 11.353 | 1964 | 11.066 | 1963 | 10.785 | 1962 | 10.511 | 1961 | 10.243 | 1960 | 10.091 |
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