Year | Value | 2022 | 8.017 | 2021 | 8.11 | 2020 | 8.202 | 2019 | 8.292 | 2018 | 8.382 | 2017 | 8.47 | 2016 | 8.557 | 2015 | 8.643 | 2014 | 8.727 | 2013 | 8.81 | 2012 | 8.892 | 2011 | 8.972 | 2010 | 9.051 | 2009 | 9.128 | 2008 | 9.205 | 2007 | 9.284 | 2006 | 9.362 | 2005 | 9.442 | 2004 | 9.522 | 2003 | 9.602 | 2002 | 9.684 | 2001 | 9.765 | 2000 | 9.848 | 1999 | 9.962 | 1998 | 10.088 | 1997 | 10.216 | 1996 | 10.345 | 1995 | 10.443 | 1994 | 10.408 | 1993 | 10.373 | 1992 | 10.338 | 1991 | 10.303 | 1990 | 10.269 | 1989 | 10.465 | 1988 | 10.743 | 1987 | 11.029 | 1986 | 11.321 | 1985 | 11.619 | 1984 | 11.924 | 1983 | 12.237 | 1982 | 12.556 | 1981 | 12.883 | 1980 | 13.216 | 1979 | 14.15 | 1978 | 15.349 | 1977 | 16.63 | 1976 | 17.993 | 1975 | 19.446 | 1974 | 20.984 | 1973 | 22.72 | 1972 | 24.979 | 1971 | 27.391 | 1970 | 29.938 | 1969 | 32.616 | 1968 | 35.408 | 1967 | 38.312 | 1966 | 39.769 | 1965 | 41.241 | 1964 | 42.726 | 1963 | 44.229 | 1962 | 45.74 | 1961 | 47.259 | 1960 | 48.781 |
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