Year | Value | 2022 | 11.633 | 2021 | 11.76 | 2020 | 11.884 | 2019 | 12.006 | 2018 | 12.126 | 2017 | 12.243 | 2016 | 12.358 | 2015 | 12.474 | 2014 | 12.59 | 2013 | 12.708 | 2012 | 12.858 | 2011 | 13.043 | 2010 | 13.205 | 2009 | 13.346 | 2008 | 13.513 | 2007 | 13.707 | 2006 | 13.902 | 2005 | 14.144 | 2004 | 14.434 | 2003 | 14.64 | 2002 | 14.75 | 2001 | 14.85 | 2000 | 14.9 | 1999 | 14.914 | 1998 | 14.94 | 1997 | 14.967 | 1996 | 14.994 | 1995 | 15.021 | 1994 | 15.048 | 1993 | 15.075 | 1992 | 15.102 | 1991 | 15.129 | 1990 | 15.157 | 1989 | 15.223 | 1988 | 15.329 | 1987 | 15.435 | 1986 | 15.542 | 1985 | 15.649 | 1984 | 15.757 | 1983 | 15.866 | 1982 | 15.975 | 1981 | 16.085 | 1980 | 16.277 | 1979 | 16.552 | 1978 | 16.831 | 1977 | 17.114 | 1976 | 17.4 | 1975 | 17.854 | 1974 | 18.317 | 1973 | 18.789 | 1972 | 19.269 | 1971 | 19.761 | 1970 | 20.263 | 1969 | 20.778 | 1968 | 21.302 | 1967 | 21.837 | 1966 | 22.381 | 1965 | 22.952 | 1964 | 23.591 | 1963 | 24.243 | 1962 | 24.907 | 1961 | 25.583 | 1960 | 26.313 |
|