Year | Value | 2021 | 10.299 | 2020 | 8.205 | 2019 | 8.068 | 2018 | 7.976 | 2017 | 7.968 | 2016 | 7.848 | 2015 | 7.706 | 2014 | 7.724 | 2013 | 7.645 | 2012 | 7.479 | 2011 | 7.34 | 2010 | 7.32 | 2009 | 7.237 | 2008 | 7.118 | 2007 | 7.019 | 2006 | 6.95 | 2005 | 6.924 | 2004 | 6.901 | 2003 | 6.901 | 2002 | 6.929 | 2001 | 6.961 | 2000 | 6.98 | 1999 | 6.862 | 1998 | 6.729 | 1997 | 6.556 | 1996 | 6.371 | 1995 | 6.207 | 1994 | 6.095 | 1993 | 5.943 | 1992 | 5.965 | 1991 | 5.999 | 1990 | 6.061 | 1989 | 6.054 | 1988 | 6.07 | 1987 | 6.049 | 1986 | 5.915 | 1985 | 5.943 | 1984 | 5.823 | 1983 | 5.971 | 1982 | 6.274 | 1981 | 6.487 | 1980 | 6.816 | 1979 | 6.957 | 1978 | 6.991 | 1977 | 7.185 | 1976 | 7.461 | 1975 | 7.61 | 1974 | 7.78 | 1973 | 8.113 | 1972 | 8.238 | 1971 | 8.339 | 1970 | 8.538 | 1969 | 8.828 | 1968 | 9.098 | 1967 | 9.595 | 1966 | 10.142 | 1965 | 10.729 | 1964 | 11.347 | 1963 | 12.08 | 1962 | 12.68 | 1961 | 13.391 | 1960 | 14.175 |
|