Year | Value | 2022 | 49.252008050388 | 2021 | 49.274252470075 | 2020 | 49.30260202104 | 2019 | 49.323110713571 | 2018 | 49.334804505423 | 2017 | 49.344406459144 | 2016 | 49.354121849511 | 2015 | 49.363508296786 | 2014 | 49.371937378184 | 2013 | 49.380737776799 | 2012 | 49.391061123065 | 2011 | 49.401410237929 | 2010 | 49.412448739613 | 2009 | 49.425725129036 | 2008 | 49.440588066878 | 2007 | 49.453073128726 | 2006 | 49.462626830664 | 2005 | 49.472270295948 | 2004 | 49.482420712036 | 2003 | 49.493059569873 | 2002 | 49.504304004372 | 2001 | 49.515495026792 | 2000 | 49.527788335049 | 1999 | 49.540025856628 | 1998 | 49.549881397372 | 1997 | 49.55971127308 | 1996 | 49.569802343775 | 1995 | 49.579763590279 | 1994 | 49.588754242395 | 1993 | 49.599253078244 | 1992 | 49.612619845609 | 1991 | 49.626843379196 | 1990 | 49.640898386007 | 1989 | 49.654133594362 | 1988 | 49.666671283341 | 1987 | 49.678901509421 | 1986 | 49.69146516943 | 1985 | 49.703866042332 | 1984 | 49.717189967082 | 1983 | 49.731803372824 | 1982 | 49.74788075544 | 1981 | 49.764929418048 | 1980 | 49.781022775332 | 1979 | 49.797531061555 | 1978 | 49.814741006264 | 1977 | 49.83114260229 | 1976 | 49.850565400152 | 1975 | 49.872821667852 | 1974 | 49.895109455268 | 1973 | 49.918387006686 | 1972 | 49.94203500788 | 1971 | 49.966919659308 | 1970 | 49.984512247192 | 1969 | 49.994191425533 | 1968 | 50.004580479544 | 1967 | 50.014929751186 | 1966 | 50.025198203451 | 1965 | 50.036149750699 | 1964 | 50.047714119592 | 1963 | 50.059503317726 | 1962 | 50.07209784826 | 1961 | 50.086073893566 | 1960 | 50.101066301343 |
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