Year | Value | 2022 | 49.600000282948 | 2021 | 49.614650802155 | 2020 | 49.625944357539 | 2019 | 49.636448995708 | 2018 | 49.647792277996 | 2017 | 49.656349434691 | 2016 | 49.66038045524 | 2015 | 49.656658119949 | 2014 | 49.64243683793 | 2013 | 49.621564665762 | 2012 | 49.601078622242 | 2011 | 49.587880425422 | 2010 | 49.581549554189 | 2009 | 49.574915671865 | 2008 | 49.565736621262 | 2007 | 49.558181281724 | 2006 | 49.555705925656 | 2005 | 49.556888043953 | 2004 | 49.558524998273 | 2003 | 49.556190864899 | 2002 | 49.547994802603 | 2001 | 49.533805260522 | 2000 | 49.513839840288 | 1999 | 49.489363783673 | 1998 | 49.459377536078 | 1997 | 49.423472986206 | 1996 | 49.384103716934 | 1995 | 49.339077665647 | 1994 | 49.287290544735 | 1993 | 49.231658250178 | 1992 | 49.172709476073 | 1991 | 49.129325953711 | 1990 | 49.103564754623 | 1989 | 49.079429417725 | 1988 | 49.05450769809 | 1987 | 49.026792994742 | 1986 | 48.997504610576 | 1985 | 48.964193313351 | 1984 | 48.92444884159 | 1983 | 48.875976248465 | 1982 | 48.823152873742 | 1981 | 48.771125286559 | 1980 | 48.720936004188 | 1979 | 48.673880614371 | 1978 | 48.631256654097 | 1977 | 48.593697002375 | 1976 | 48.560916409377 | 1975 | 48.533069341728 | 1974 | 48.506137081747 | 1973 | 48.479581765468 | 1972 | 48.455567511913 | 1971 | 48.437525680715 | 1970 | 48.392090543174 | 1969 | 48.312043671288 | 1968 | 48.228156906847 | 1967 | 48.140546638519 | 1966 | 48.049217465145 | 1965 | 47.955182008693 | 1964 | 47.858398625999 | 1963 | 47.763969978895 | 1962 | 47.67369003083 | 1961 | 47.583536989242 | 1960 | 47.492557833957 |
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