Year | Value | 2022 | 49.829533026727 | 2021 | 49.823043972425 | 2020 | 49.815927060613 | 2019 | 49.807048260879 | 2018 | 49.797363908899 | 2017 | 49.786042018967 | 2016 | 49.778770359817 | 2015 | 49.76576494149 | 2014 | 49.745126989274 | 2013 | 49.729999121326 | 2012 | 49.715976820879 | 2011 | 49.702150829099 | 2010 | 49.687523085995 | 2009 | 49.673107373861 | 2008 | 49.658380650562 | 2007 | 49.6410008565 | 2006 | 49.622004670204 | 2005 | 49.603846700025 | 2004 | 49.586204291546 | 2003 | 49.567072734415 | 2002 | 49.54814224397 | 2001 | 49.532157882753 | 2000 | 49.51751614963 | 1999 | 49.506035155273 | 1998 | 49.500054335438 | 1997 | 49.493290784683 | 1996 | 49.501158214423 | 1995 | 49.524552625788 | 1994 | 49.544879127455 | 1993 | 49.565566816511 | 1992 | 49.590373488376 | 1991 | 49.599715072112 | 1990 | 49.59232628396 | 1989 | 49.584445212694 | 1988 | 49.581546142573 | 1987 | 49.579574779716 | 1986 | 49.569934711647 | 1985 | 49.600733965205 | 1984 | 49.667386490655 | 1983 | 49.727403005322 | 1982 | 49.777022412701 | 1981 | 49.811360243142 | 1980 | 49.802421595265 | 1979 | 49.773357385317 | 1978 | 49.770075318213 | 1977 | 49.765791821342 | 1976 | 49.755930770539 | 1975 | 49.742553686372 | 1974 | 49.723188817051 | 1973 | 49.703262318847 | 1972 | 49.686736791393 | 1971 | 49.671897044018 | 1970 | 49.66572967037 | 1969 | 49.668606417672 | 1968 | 49.670941283679 | 1967 | 49.674270015105 | 1966 | 49.677004484937 | 1965 | 49.678943971161 | 1964 | 49.681976985493 | 1963 | 49.685442934272 | 1962 | 49.688460291268 | 1961 | 49.693883954445 | 1960 | 49.700965747155 |
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