Year | Value | 2022 | 13.116 | 2021 | 13.211 | 2020 | 13.301 | 2019 | 13.385 | 2018 | 13.462 | 2017 | 13.534 | 2016 | 13.6 | 2015 | 13.659 | 2014 | 13.719 | 2013 | 13.779 | 2012 | 13.839 | 2011 | 13.9 | 2010 | 13.84 | 2009 | 13.78 | 2008 | 13.72 | 2007 | 13.66 | 2006 | 13.6 | 2005 | 13.659 | 2004 | 13.719 | 2003 | 13.779 | 2002 | 13.839 | 2001 | 13.9 | 2000 | 13.979 | 1999 | 14.059 | 1998 | 14.139 | 1997 | 14.219 | 1996 | 14.3 | 1995 | 14.447 | 1994 | 14.596 | 1993 | 14.746 | 1992 | 14.897 | 1991 | 15.05 | 1990 | 15.258 | 1989 | 15.494 | 1988 | 15.732 | 1987 | 15.975 | 1986 | 16.22 | 1985 | 16.327 | 1984 | 16.367 | 1983 | 16.408 | 1982 | 16.448 | 1981 | 16.489 | 1980 | 16.572 | 1979 | 16.672 | 1978 | 16.771 | 1977 | 16.872 | 1976 | 16.972 | 1975 | 17.226 | 1974 | 17.54 | 1973 | 17.859 | 1972 | 18.181 | 1971 | 18.509 | 1970 | 18.894 | 1969 | 19.305 | 1968 | 19.723 | 1967 | 20.148 | 1966 | 20.579 | 1965 | 21.109 | 1964 | 21.683 | 1963 | 22.27 | 1962 | 22.867 | 1961 | 23.475 | 1960 | 24.002 |
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