Year | Value | 2021 | 10.832 | 2020 | 10.859 | 2019 | 10.885 | 2018 | 10.913 | 2017 | 10.952 | 2016 | 11.009 | 2015 | 11.095 | 2014 | 11.221 | 2013 | 11.392 | 2012 | 11.603 | 2011 | 11.846 | 2010 | 12.115 | 2009 | 12.396 | 2008 | 12.681 | 2007 | 12.943 | 2006 | 13.177 | 2005 | 13.371 | 2004 | 13.547 | 2003 | 13.68 | 2002 | 13.77 | 2001 | 13.823 | 2000 | 13.955 | 1999 | 14.077 | 1998 | 14.203 | 1997 | 14.36 | 1996 | 14.528 | 1995 | 14.714 | 1994 | 14.903 | 1993 | 15.087 | 1992 | 15.261 | 1991 | 15.429 | 1990 | 15.622 | 1989 | 15.847 | 1988 | 16.114 | 1987 | 16.402 | 1986 | 16.732 | 1985 | 17.12 | 1984 | 17.491 | 1983 | 17.825 | 1982 | 18.136 | 1981 | 18.313 | 1980 | 18.41 | 1979 | 18.446 | 1978 | 18.467 | 1977 | 18.263 | 1976 | 18.396 | 1975 | 18.682 | 1974 | 18.923 | 1973 | 19.183 | 1972 | 19.436 | 1971 | 19.789 | 1970 | 20.398 | 1969 | 21.122 | 1968 | 22.011 | 1967 | 23.058 | 1966 | 24.256 | 1965 | 25.397 | 1964 | 26.655 | 1963 | 27.906 | 1962 | 29.082 | 1961 | 30.182 | 1960 | 30.639 |
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