Year | Value | 2022 | 8.173 | 2021 | 8.374 | 2020 | 8.582 | 2019 | 8.797 | 2018 | 9.021 | 2017 | 9.253 | 2016 | 9.494 | 2015 | 9.744 | 2014 | 10 | 2013 | 10.875 | 2012 | 11.815 | 2011 | 12.828 | 2010 | 13.912 | 2009 | 15.072 | 2008 | 16.308 | 2007 | 17.629 | 2006 | 19.03 | 2005 | 20.515 | 2004 | 21.679 | 2003 | 21.692 | 2002 | 21.704 | 2001 | 21.717 | 2000 | 21.73 | 1999 | 21.742 | 1998 | 21.755 | 1997 | 21.768 | 1996 | 21.78 | 1995 | 21.793 | 1994 | 22.26 | 1993 | 23.32 | 1992 | 24.414 | 1991 | 25.545 | 1990 | 26.709 | 1989 | 27.905 | 1988 | 29.132 | 1987 | 30.394 | 1986 | 31.685 | 1985 | 33.004 | 1984 | 34.348 | 1983 | 35.722 | 1982 | 37.118 | 1981 | 38.536 | 1980 | 39.971 | 1979 | 41.02 | 1978 | 41.351 | 1977 | 41.684 | 1976 | 42.016 | 1975 | 42.35 | 1974 | 42.685 | 1973 | 43.02 | 1972 | 43.355 | 1971 | 43.692 | 1970 | 44.029 | 1969 | 44.367 | 1968 | 44.704 | 1967 | 45.043 | 1966 | 45.39 | 1965 | 45.738 | 1964 | 46.086 | 1963 | 46.435 | 1962 | 46.785 | 1961 | 47.588 | 1960 | 49.121 |
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