Year | Value | 2022 | 49.654345915039 | 2021 | 49.639959459499 | 2020 | 49.622780612345 | 2019 | 49.608783069881 | 2018 | 49.5971691893 | 2017 | 49.586614570951 | 2016 | 49.575863245667 | 2015 | 49.566229374307 | 2014 | 49.560981522847 | 2013 | 49.558029968207 | 2012 | 49.55476621838 | 2011 | 49.551917119296 | 2010 | 49.549046224362 | 2009 | 49.545421504891 | 2008 | 49.540614737496 | 2007 | 49.536687422285 | 2006 | 49.534162398157 | 2005 | 49.5320878605 | 2004 | 49.531393468233 | 2003 | 49.532075788861 | 2002 | 49.533522767834 | 2001 | 49.535567478345 | 2000 | 49.540096678775 | 1999 | 49.546049297313 | 1998 | 49.550514725465 | 1997 | 49.555816170343 | 1996 | 49.560537493354 | 1995 | 49.562841311615 | 1994 | 49.565321562381 | 1993 | 49.567748427291 | 1992 | 49.569734614286 | 1991 | 49.574713450199 | 1990 | 49.582150586693 | 1989 | 49.58997383885 | 1988 | 49.59576490286 | 1987 | 49.600157078886 | 1986 | 49.604788193934 | 1985 | 49.60344128782 | 1984 | 49.597103556008 | 1983 | 49.591129167616 | 1982 | 49.586560410501 | 1981 | 49.585984442351 | 1980 | 49.589911391172 | 1979 | 49.591438014109 | 1978 | 49.589684134683 | 1977 | 49.590619587976 | 1976 | 49.591533761307 | 1975 | 49.59303976302 | 1974 | 49.600382034958 | 1973 | 49.611865161174 | 1972 | 49.624178418489 | 1971 | 49.631243901067 | 1970 | 49.632741922756 | 1969 | 49.636457645807 | 1968 | 49.642541237989 | 1967 | 49.647698579685 | 1966 | 49.65252261608 | 1965 | 49.657466315274 | 1964 | 49.661991025761 | 1963 | 49.669305997302 | 1962 | 49.67720510126 | 1961 | 49.679787968346 | 1960 | 49.676072294817 |
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