Year | Value | 2022 | 29.943 | 2021 | 29.48 | 2020 | 29.028 | 2019 | 28.585 | 2018 | 28.153 | 2017 | 27.73 | 2016 | 27.317 | 2015 | 26.908 | 2014 | 26.502 | 2013 | 26.101 | 2012 | 25.704 | 2011 | 25.31 | 2010 | 24.798 | 2009 | 24.293 | 2008 | 23.796 | 2007 | 23.304 | 2006 | 22.82 | 2005 | 22.249 | 2004 | 21.689 | 2003 | 21.137 | 2002 | 20.597 | 2001 | 20.067 | 2000 | 19.548 | 1999 | 19.038 | 1998 | 18.538 | 1997 | 18.049 | 1996 | 17.571 | 1995 | 16.955 | 1994 | 16.319 | 1993 | 15.703 | 1992 | 15.106 | 1991 | 14.527 | 1990 | 13.967 | 1989 | 13.425 | 1988 | 12.901 | 1987 | 12.394 | 1986 | 11.905 | 1985 | 11.752 | 1984 | 11.691 | 1983 | 11.63 | 1982 | 11.57 | 1981 | 11.51 | 1980 | 11.45 | 1979 | 11.39 | 1978 | 11.331 | 1977 | 11.272 | 1976 | 11.213 | 1975 | 10.822 | 1974 | 10.355 | 1973 | 9.905 | 1972 | 9.474 | 1971 | 9.039 | 1970 | 8.608 | 1969 | 8.196 | 1968 | 7.802 | 1967 | 7.425 | 1966 | 7.065 | 1965 | 6.366 | 1964 | 5.661 | 1963 | 5.029 | 1962 | 4.464 | 1961 | 3.96 | 1960 | 3.512 |
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