Year | Value | 2022 | 49.562825307792 | 2021 | 49.578114499343 | 2020 | 49.591826841879 | 2019 | 49.600537374304 | 2018 | 49.615901282526 | 2017 | 49.636479525257 | 2016 | 49.650729402666 | 2015 | 49.664463164969 | 2014 | 49.681674515391 | 2013 | 49.694316228157 | 2012 | 49.704236441062 | 2011 | 49.714747064065 | 2010 | 49.720475953803 | 2009 | 49.717887851992 | 2008 | 49.709631242792 | 2007 | 49.697725567978 | 2006 | 49.684249963027 | 2005 | 49.668671799606 | 2004 | 49.650127690876 | 2003 | 49.630468951426 | 2002 | 49.610216016114 | 2001 | 49.589594049347 | 2000 | 49.570064521114 | 1999 | 49.554370348281 | 1998 | 49.543224092302 | 1997 | 49.535933666391 | 1996 | 49.531470028537 | 1995 | 49.527848568962 | 1994 | 49.524756192607 | 1993 | 49.522984361505 | 1992 | 49.522725413487 | 1991 | 49.521873164972 | 1990 | 49.518490610743 | 1989 | 49.51280391381 | 1988 | 49.505977077166 | 1987 | 49.498335751194 | 1986 | 49.489727109617 | 1985 | 49.48240455135 | 1984 | 49.475795459926 | 1983 | 49.468636612902 | 1982 | 49.463477883657 | 1981 | 49.462014747799 | 1980 | 49.458192820417 | 1979 | 49.451663644698 | 1978 | 49.448921794 | 1977 | 49.447478299548 | 1976 | 49.443975961881 | 1975 | 49.43728012231 | 1974 | 49.432067633706 | 1973 | 49.431981194954 | 1972 | 49.435542907382 | 1971 | 49.441066181943 | 1970 | 49.444303873927 | 1969 | 49.445561689964 | 1968 | 49.448170541264 | 1967 | 49.451998555445 | 1966 | 49.456945373194 | 1965 | 49.464506833077 | 1964 | 49.474771002943 | 1963 | 49.488203099848 | 1962 | 49.505068285368 | 1961 | 49.525639735221 | 1960 | 49.550825105287 |
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