Year | Value | 2021 | 6.156 | 2020 | 6.206 | 2019 | 6.253 | 2018 | 6.302 | 2017 | 6.349 | 2016 | 6.392 | 2015 | 6.437 | 2014 | 6.483 | 2013 | 6.527 | 2012 | 6.559 | 2011 | 6.582 | 2010 | 6.587 | 2009 | 6.591 | 2008 | 6.578 | 2007 | 6.582 | 2006 | 6.59 | 2005 | 6.597 | 2004 | 6.618 | 2003 | 6.64 | 2002 | 6.672 | 2001 | 6.7 | 2000 | 6.718 | 1999 | 6.721 | 1998 | 6.73 | 1997 | 6.729 | 1996 | 6.72 | 1995 | 6.712 | 1994 | 6.668 | 1993 | 6.644 | 1992 | 6.667 | 1991 | 6.685 | 1990 | 6.702 | 1989 | 6.735 | 1988 | 6.73 | 1987 | 6.741 | 1986 | 6.693 | 1985 | 6.646 | 1984 | 6.599 | 1983 | 6.548 | 1982 | 6.498 | 1981 | 6.486 | 1980 | 6.465 | 1979 | 6.456 | 1978 | 6.441 | 1977 | 6.429 | 1976 | 6.425 | 1975 | 6.424 | 1974 | 6.416 | 1973 | 6.411 | 1972 | 6.402 | 1971 | 6.378 | 1970 | 6.343 | 1969 | 6.319 | 1968 | 6.298 | 1967 | 6.268 | 1966 | 6.237 | 1965 | 6.211 | 1964 | 6.183 | 1963 | 6.157 | 1962 | 6.132 | 1961 | 6.107 | 1960 | 6.08 |
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