Year | Value | 2022 | 11.508 | 2021 | 11.762 | 2020 | 12.023 | 2019 | 12.292 | 2018 | 12.569 | 2017 | 12.854 | 2016 | 13.148 | 2015 | 13.447 | 2014 | 13.753 | 2013 | 14.064 | 2012 | 14.38 | 2011 | 14.703 | 2010 | 14.944 | 2009 | 15.098 | 2008 | 15.254 | 2007 | 15.412 | 2006 | 15.57 | 2005 | 15.681 | 2004 | 15.742 | 2003 | 15.804 | 2002 | 15.867 | 2001 | 15.929 | 2000 | 15.974 | 1999 | 16.002 | 1998 | 16.03 | 1997 | 16.058 | 1996 | 16.086 | 1995 | 16.176 | 1994 | 16.329 | 1993 | 16.484 | 1992 | 16.639 | 1991 | 16.796 | 1990 | 16.9 | 1989 | 16.9 | 1988 | 16.9 | 1987 | 16.9 | 1986 | 16.9 | 1985 | 16.9 | 1984 | 16.9 | 1983 | 16.9 | 1982 | 16.9 | 1981 | 16.9 | 1980 | 16.913 | 1979 | 16.984 | 1978 | 17.056 | 1977 | 17.127 | 1976 | 17.198 | 1975 | 17.27 | 1974 | 17.483 | 1973 | 17.797 | 1972 | 18.114 | 1971 | 18.437 | 1970 | 18.966 | 1969 | 19.713 | 1968 | 20.481 | 1967 | 21.273 | 1966 | 22.086 | 1965 | 22.944 | 1964 | 23.847 | 1963 | 24.777 | 1962 | 25.729 | 1961 | 26.705 | 1960 | 27.51 |
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