Year | Value | 2022 | 50.156357545069 | 2021 | 50.141109573866 | 2020 | 50.125576010671 | 2019 | 50.11593169159 | 2018 | 50.108990291418 | 2017 | 50.101634533298 | 2016 | 50.092929756288 | 2015 | 50.08320833108 | 2014 | 50.07369527538 | 2013 | 50.062243871345 | 2012 | 50.052108190703 | 2011 | 50.042272682406 | 2010 | 50.029849634258 | 2009 | 50.016628488932 | 2008 | 50.004625575261 | 2007 | 49.992800534488 | 2006 | 49.977679804908 | 2005 | 49.960984517926 | 2004 | 49.945902304282 | 2003 | 49.931245660607 | 2002 | 49.912216422721 | 2001 | 49.822001145426 | 2000 | 49.666427208705 | 1999 | 49.50923470855 | 1998 | 49.430556963182 | 1997 | 49.433748753888 | 1996 | 49.432511661166 | 1995 | 49.496160212584 | 1994 | 49.51943496407 | 1993 | 49.410459148287 | 1992 | 49.284472971815 | 1991 | 49.233067836672 | 1990 | 49.241062649266 | 1989 | 49.245523005002 | 1988 | 49.257504680275 | 1987 | 49.272872234994 | 1986 | 49.289144260644 | 1985 | 49.300925703871 | 1984 | 49.309794124953 | 1983 | 49.321200278965 | 1982 | 49.335461056287 | 1981 | 49.345028937578 | 1980 | 49.348539582375 | 1979 | 49.35344804651 | 1978 | 49.36138550242 | 1977 | 49.368623989823 | 1976 | 49.374990274168 | 1975 | 49.383967310273 | 1974 | 49.39362464122 | 1973 | 49.403151351589 | 1972 | 49.413105393013 | 1971 | 49.42811605873 | 1970 | 49.443952527277 | 1969 | 49.455525613069 | 1968 | 49.473498590843 | 1967 | 49.502124131888 | 1966 | 49.541655424132 | 1965 | 49.590111512925 | 1964 | 49.644166388254 | 1963 | 49.701690771728 | 1962 | 49.784150272016 | 1961 | 49.843631001572 | 1960 | 49.851747303004 |
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