Year | Value | 2022 | 25.114 | 2021 | 24.668 | 2020 | 24.232 | 2019 | 23.805 | 2018 | 23.388 | 2017 | 22.98 | 2016 | 22.582 | 2015 | 22.188 | 2014 | 21.799 | 2013 | 21.415 | 2012 | 21.037 | 2011 | 20.663 | 2010 | 20.294 | 2009 | 19.93 | 2008 | 19.571 | 2007 | 19.413 | 2006 | 19.293 | 2005 | 19.174 | 2004 | 19.055 | 2003 | 18.937 | 2002 | 18.82 | 2001 | 18.703 | 2000 | 18.586 | 1999 | 18.47 | 1998 | 18.355 | 1997 | 18.06 | 1996 | 17.683 | 1995 | 17.311 | 1994 | 16.946 | 1993 | 16.587 | 1992 | 16.234 | 1991 | 15.887 | 1990 | 15.546 | 1989 | 15.211 | 1988 | 14.883 | 1987 | 14.559 | 1986 | 14.242 | 1985 | 13.931 | 1984 | 13.626 | 1983 | 13.325 | 1982 | 13.031 | 1981 | 12.742 | 1980 | 9.898 | 1979 | 5.999 | 1978 | 5.578 | 1977 | 5.186 | 1976 | 4.82 | 1975 | 4.477 | 1974 | 29.055 | 1973 | 25.263 | 1972 | 21.818 | 1971 | 18.717 | 1970 | 15.97 | 1969 | 14.579 | 1968 | 13.291 | 1967 | 12.098 | 1966 | 11 | 1965 | 10.83 | 1964 | 10.662 | 1963 | 10.497 | 1962 | 10.333 | 1961 | 10.293 | 1960 | 10.285 |
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