Year | Value | 2022 | 8.119 | 2021 | 8.328 | 2020 | 8.547 | 2019 | 8.777 | 2018 | 9.019 | 2017 | 9.273 | 2016 | 9.54 | 2015 | 9.821 | 2014 | 10.116 | 2013 | 10.426 | 2012 | 10.751 | 2011 | 11.094 | 2010 | 11.453 | 2009 | 11.822 | 2008 | 12.2 | 2007 | 12.591 | 2006 | 12.991 | 2005 | 13.402 | 2004 | 13.823 | 2003 | 14.257 | 2002 | 14.701 | 2001 | 15.157 | 2000 | 15.784 | 1999 | 16.552 | 1998 | 17.107 | 1997 | 17.221 | 1996 | 17.175 | 1995 | 17.107 | 1994 | 17.518 | 1993 | 18.143 | 1992 | 18.472 | 1991 | 18.87 | 1990 | 19.053 | 1989 | 19.109 | 1988 | 19.164 | 1987 | 19.22 | 1986 | 19.275 | 1985 | 19.331 | 1984 | 19.387 | 1983 | 19.443 | 1982 | 19.499 | 1981 | 19.556 | 1980 | 19.958 | 1979 | 20.487 | 1978 | 21.025 | 1977 | 21.574 | 1976 | 22.133 | 1975 | 22.703 | 1974 | 23.283 | 1973 | 23.873 | 1972 | 24.472 | 1971 | 25.084 | 1970 | 25.626 | 1969 | 26.098 | 1968 | 26.575 | 1967 | 27.059 | 1966 | 27.548 | 1965 | 28.042 | 1964 | 28.541 | 1963 | 29.047 | 1962 | 29.557 | 1961 | 30.073 | 1960 | 30.444 |
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