Year | Value | 2021 | 5.237 | 2020 | 5.309 | 2019 | 5.379 | 2018 | 5.447 | 2017 | 5.523 | 2016 | 5.584 | 2015 | 5.616 | 2014 | 5.664 | 2013 | 5.738 | 2012 | 5.832 | 2011 | 5.918 | 2010 | 5.98 | 2009 | 6.039 | 2008 | 6.078 | 2007 | 6.08 | 2006 | 6.081 | 2005 | 6.068 | 2004 | 6.085 | 2003 | 6.116 | 2002 | 6.135 | 2001 | 6.139 | 2000 | 6.124 | 1999 | 6.082 | 1998 | 6.069 | 1997 | 6.138 | 1996 | 6.217 | 1995 | 6.273 | 1994 | 6.319 | 1993 | 6.354 | 1992 | 6.391 | 1991 | 6.426 | 1990 | 6.459 | 1989 | 6.494 | 1988 | 6.498 | 1987 | 6.504 | 1986 | 6.557 | 1985 | 6.616 | 1984 | 6.701 | 1983 | 6.775 | 1982 | 6.799 | 1981 | 6.82 | 1980 | 6.847 | 1979 | 6.887 | 1978 | 6.921 | 1977 | 6.862 | 1976 | 6.806 | 1975 | 6.773 | 1974 | 6.703 | 1973 | 6.633 | 1972 | 6.579 | 1971 | 6.532 | 1970 | 6.466 | 1969 | 6.438 | 1968 | 6.42 | 1967 | 6.401 | 1966 | 6.386 | 1965 | 6.367 | 1964 | 6.362 | 1963 | 6.349 | 1962 | 6.356 | 1961 | 6.353 | 1960 | 6.364 |
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