Year | Value | 2022 | 10.975 | 2021 | 10.962 | 2020 | 10.938 | 2019 | 10.902 | 2018 | 10.855 | 2017 | 10.797 | 2016 | 10.728 | 2015 | 10.648 | 2014 | 10.557 | 2013 | 10.456 | 2012 | 10.346 | 2011 | 10.225 | 2010 | 10.095 | 2009 | 9.966 | 2008 | 9.839 | 2007 | 9.713 | 2006 | 9.589 | 2005 | 9.466 | 2004 | 9.345 | 2003 | 9.225 | 2002 | 9.106 | 2001 | 8.989 | 2000 | 9.248 | 1999 | 9.802 | 1998 | 10.385 | 1997 | 10.998 | 1996 | 11.642 | 1995 | 12.32 | 1994 | 13.031 | 1993 | 13.776 | 1992 | 14.556 | 1991 | 15.053 | 1990 | 15.322 | 1989 | 15.595 | 1988 | 15.871 | 1987 | 16.152 | 1986 | 16.437 | 1985 | 16.726 | 1984 | 17.018 | 1983 | 17.316 | 1982 | 17.617 | 1981 | 17.922 | 1980 | 18.231 | 1979 | 18.544 | 1978 | 18.862 | 1977 | 19.183 | 1976 | 19.509 | 1975 | 19.839 | 1974 | 20.173 | 1973 | 20.512 | 1972 | 20.854 | 1971 | 21.201 | 1970 | 21.552 | 1969 | 21.907 | 1968 | 22.266 | 1967 | 22.63 | 1966 | 22.997 | 1965 | 23.369 | 1964 | 23.745 | 1963 | 24.125 | 1962 | 24.51 | 1961 | 24.898 | 1960 | 25.29 |
|