Year | Value | 2022 | 7.114 | 2021 | 7.428 | 2020 | 7.764 | 2019 | 8.124 | 2018 | 8.51 | 2017 | 8.923 | 2016 | 9.365 | 2015 | 9.827 | 2014 | 10.31 | 2013 | 10.813 | 2012 | 11.412 | 2011 | 12.121 | 2010 | 12.866 | 2009 | 13.712 | 2008 | 14.598 | 2007 | 15.461 | 2006 | 16.364 | 2005 | 17.37 | 2004 | 18.486 | 2003 | 19.659 | 2002 | 20.887 | 2001 | 22.17 | 2000 | 23.205 | 1999 | 23.97 | 1998 | 24.75 | 1997 | 25.547 | 1996 | 26.36 | 1995 | 27.191 | 1994 | 28.038 | 1993 | 28.9 | 1992 | 29.777 | 1991 | 30.671 | 1990 | 31.316 | 1989 | 31.704 | 1988 | 32.094 | 1987 | 32.487 | 1986 | 32.883 | 1985 | 33.281 | 1984 | 33.681 | 1983 | 34.084 | 1982 | 34.489 | 1981 | 34.896 | 1980 | 35.255 | 1979 | 35.565 | 1978 | 35.877 | 1977 | 36.189 | 1976 | 36.502 | 1975 | 36.817 | 1974 | 37.133 | 1973 | 37.45 | 1972 | 37.768 | 1971 | 38.087 | 1970 | 38.337 | 1969 | 38.519 | 1968 | 38.7 | 1967 | 38.882 | 1966 | 39.064 | 1965 | 39.247 | 1964 | 39.43 | 1963 | 39.613 | 1962 | 39.796 | 1961 | 39.98 | 1960 | 40.248 |
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