Year | Value | 2022 | 7.237 | 2021 | 7.326 | 2020 | 7.413 | 2019 | 7.499 | 2018 | 7.582 | 2017 | 7.664 | 2016 | 7.744 | 2015 | 7.821 | 2014 | 7.896 | 2013 | 7.969 | 2012 | 8.04 | 2011 | 8.108 | 2010 | 8.174 | 2009 | 8.237 | 2008 | 8.298 | 2007 | 8.359 | 2006 | 8.42 | 2005 | 8.482 | 2004 | 8.544 | 2003 | 8.607 | 2002 | 8.67 | 2001 | 8.733 | 2000 | 8.797 | 1999 | 8.861 | 1998 | 8.926 | 1997 | 8.991 | 1996 | 9.057 | 1995 | 9.134 | 1994 | 9.233 | 1993 | 9.334 | 1992 | 9.435 | 1991 | 9.537 | 1990 | 9.641 | 1989 | 9.745 | 1988 | 9.85 | 1987 | 9.956 | 1986 | 10.064 | 1985 | 10.172 | 1984 | 10.281 | 1983 | 10.392 | 1982 | 10.713 | 1981 | 11.06 | 1980 | 11.417 | 1979 | 11.785 | 1978 | 12.162 | 1977 | 12.55 | 1976 | 12.947 | 1975 | 13.357 | 1974 | 13.776 | 1973 | 14.207 | 1972 | 14.649 | 1971 | 15.211 | 1970 | 15.805 | 1969 | 16.418 | 1968 | 17.048 | 1967 | 17.7 | 1966 | 18.37 | 1965 | 19.06 | 1964 | 19.768 | 1963 | 20.498 | 1962 | 21.246 | 1961 | 22.015 | 1960 | 23.152 |
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