Year | Value | 2022 | 49.735282453394 | 2021 | 49.72232422058 | 2020 | 49.705180465139 | 2019 | 49.691859169209 | 2018 | 49.684689251792 | 2017 | 49.67980768285 | 2016 | 49.676122064024 | 2015 | 49.675694261802 | 2014 | 49.678475836607 | 2013 | 49.681273194442 | 2012 | 49.684431239189 | 2011 | 49.688338527803 | 2010 | 49.690678392098 | 2009 | 49.691856082514 | 2008 | 49.694827085034 | 2007 | 49.699835983062 | 2006 | 49.70569526181 | 2005 | 49.710270450383 | 2004 | 49.71338371616 | 2003 | 49.71604736294 | 2002 | 49.718986491793 | 2001 | 49.722326767019 | 2000 | 49.728539910909 | 1999 | 49.736893222117 | 1998 | 49.744179902838 | 1997 | 49.752005317075 | 1996 | 49.759303719233 | 1995 | 49.764610009018 | 1994 | 49.770355888545 | 1993 | 49.776614110474 | 1992 | 49.782899274079 | 1991 | 49.792317009103 | 1990 | 49.803695207356 | 1989 | 49.81585403246 | 1988 | 49.827119198202 | 1987 | 49.837152439259 | 1986 | 49.847560967097 | 1985 | 49.853023633726 | 1984 | 49.853785468481 | 1983 | 49.854579150558 | 1982 | 49.856427894072 | 1981 | 49.861137713878 | 1980 | 49.869955320469 | 1979 | 49.876625144841 | 1978 | 49.879441208355 | 1977 | 49.884215915555 | 1976 | 49.889467625404 | 1975 | 49.895548482256 | 1974 | 49.906573130375 | 1973 | 49.921370403523 | 1972 | 49.93739224317 | 1971 | 49.950711698858 | 1970 | 49.960694676937 | 1969 | 49.971374148992 | 1968 | 49.981197197366 | 1967 | 49.987499205723 | 1966 | 49.991081616966 | 1965 | 49.995527755343 | 1964 | 50.002260154708 | 1963 | 50.012826723159 | 1962 | 50.02385038111 | 1961 | 50.029363054035 | 1960 | 50.028945351371 |
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