Year | Value | 2021 | 10.24 | 2020 | 10.285 | 2019 | 10.343 | 2018 | 10.517 | 2017 | 10.87 | 2016 | 11.289 | 2015 | 11.718 | 2014 | 12.15 | 2013 | 12.279 | 2012 | 12.227 | 2011 | 12.035 | 2010 | 11.92 | 2009 | 11.841 | 2008 | 11.868 | 2007 | 12.07 | 2006 | 12.539 | 2005 | 13.235 | 2004 | 13.978 | 2003 | 14.668 | 2002 | 15.209 | 2001 | 16.12 | 2000 | 17.076 | 1999 | 17.982 | 1998 | 18.803 | 1997 | 19.81 | 1996 | 20.987 | 1995 | 21.809 | 1994 | 22.244 | 1993 | 22.47 | 1992 | 23.145 | 1991 | 23.723 | 1990 | 24.415 | 1989 | 24.86 | 1988 | 25.364 | 1987 | 25.685 | 1986 | 25.935 | 1985 | 26.297 | 1984 | 26.621 | 1983 | 26.722 | 1982 | 26.795 | 1981 | 26.654 | 1980 | 26.769 | 1979 | 27.203 | 1978 | 27.888 | 1977 | 28.589 | 1976 | 29.357 | 1975 | 29.987 | 1974 | 30.297 | 1973 | 30.697 | 1972 | 31.231 | 1971 | 31.747 | 1970 | 32.201 | 1969 | 33.075 | 1968 | 33.512 | 1967 | 33.898 | 1966 | 34.356 | 1965 | 35.362 | 1964 | 36.825 | 1963 | 38.149 | 1962 | 39.216 | 1961 | 40.332 | 1960 | 41.068 |
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