Year | Value | 2022 | 12.273 | 2021 | 12.493 | 2020 | 12.718 | 2019 | 12.948 | 2018 | 13.184 | 2017 | 13.426 | 2016 | 13.674 | 2015 | 13.929 | 2014 | 14.187 | 2013 | 14.449 | 2012 | 14.8 | 2011 | 15.245 | 2010 | 15.617 | 2009 | 15.913 | 2008 | 16.213 | 2007 | 16.518 | 2006 | 16.828 | 2005 | 17.142 | 2004 | 17.42 | 2003 | 17.662 | 2002 | 17.905 | 2001 | 18.151 | 2000 | 18.4 | 1999 | 18.524 | 1998 | 18.649 | 1997 | 18.774 | 1996 | 18.9 | 1995 | 19.098 | 1994 | 19.297 | 1993 | 19.497 | 1992 | 19.699 | 1991 | 19.967 | 1990 | 20.302 | 1989 | 20.641 | 1988 | 20.984 | 1987 | 21.332 | 1986 | 21.683 | 1985 | 22.039 | 1984 | 22.398 | 1983 | 22.763 | 1982 | 23.131 | 1981 | 23.503 | 1980 | 23.879 | 1979 | 24.26 | 1978 | 24.645 | 1977 | 25.034 | 1976 | 25.375 | 1975 | 25.611 | 1974 | 25.848 | 1973 | 26.086 | 1972 | 26.325 | 1971 | 26.567 | 1970 | 27.256 | 1969 | 28.519 | 1968 | 29.814 | 1967 | 31.147 | 1966 | 32.509 | 1965 | 33.95 | 1964 | 35.466 | 1963 | 37.017 | 1962 | 38.594 | 1961 | 40.194 | 1960 | 41.466 |
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