Year | Value | 2022 | 12.189 | 2021 | 12.142 | 2020 | 12.084 | 2019 | 12.016 | 2018 | 11.938 | 2017 | 11.85 | 2016 | 11.752 | 2015 | 11.655 | 2014 | 11.559 | 2013 | 11.463 | 2012 | 11.369 | 2011 | 11.274 | 2010 | 11.181 | 2009 | 11.088 | 2008 | 10.996 | 2007 | 10.692 | 2006 | 10.193 | 2005 | 9.715 | 2004 | 9.249 | 2003 | 8.793 | 2002 | 8.359 | 2001 | 7.944 | 2000 | 7.605 | 1999 | 7.334 | 1998 | 7.073 | 1997 | 6.82 | 1996 | 6.575 | 1995 | 6.339 | 1994 | 6.11 | 1993 | 5.889 | 1992 | 5.676 | 1991 | 5.47 | 1990 | 5.288 | 1989 | 5.128 | 1988 | 4.973 | 1987 | 4.822 | 1986 | 4.675 | 1985 | 4.841 | 1984 | 5.351 | 1983 | 5.911 | 1982 | 6.526 | 1981 | 7.2 | 1980 | 7.936 | 1979 | 8.743 | 1978 | 9.622 | 1977 | 10.58 | 1976 | 11.618 | 1975 | 12.748 | 1974 | 13.968 | 1973 | 15.284 | 1972 | 16.699 | 1971 | 18.22 | 1970 | 19.845 | 1969 | 21.576 | 1968 | 23.412 | 1967 | 25.359 | 1966 | 27.407 | 1965 | 29.555 | 1964 | 31.795 | 1963 | 34.128 | 1962 | 36.538 | 1961 | 39.017 | 1960 | 41.55 |
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