Year | Value | 2021 | 9.945 | 2020 | 9.3 | 2019 | 7.127 | 2018 | 7.124 | 2017 | 7.107 | 2016 | 7.104 | 2015 | 7.216 | 2014 | 7.262 | 2013 | 7.306 | 2012 | 7.433 | 2011 | 7.496 | 2010 | 7.66 | 2009 | 7.788 | 2008 | 7.995 | 2007 | 8.204 | 2006 | 8.345 | 2005 | 8.554 | 2004 | 8.787 | 2003 | 9.038 | 2002 | 9.287 | 2001 | 9.636 | 2000 | 9.826 | 1999 | 9.992 | 1998 | 10.156 | 1997 | 10.329 | 1996 | 10.525 | 1995 | 10.625 | 1994 | 10.689 | 1993 | 10.736 | 1992 | 11.191 | 1991 | 11.518 | 1990 | 11.925 | 1989 | 12.319 | 1988 | 12.699 | 1987 | 13.107 | 1986 | 13.461 | 1985 | 13.784 | 1984 | 14.112 | 1983 | 14.508 | 1982 | 14.791 | 1981 | 15.129 | 1980 | 15.472 | 1979 | 15.865 | 1978 | 16.245 | 1977 | 16.604 | 1976 | 16.978 | 1975 | 17.344 | 1974 | 17.684 | 1973 | 18.084 | 1972 | 18.497 | 1971 | 18.894 | 1970 | 19.313 | 1969 | 19.689 | 1968 | 20.09 | 1967 | 20.461 | 1966 | 20.793 | 1965 | 21.207 | 1964 | 21.577 | 1963 | 21.911 | 1962 | 22.241 | 1961 | 22.637 | 1960 | 22.968 |
|