Year | Value | 2024 | 49.196141523085 | 2023 | 49.215071621733 | 2022 | 49.23717376857 | 2021 | 49.265721860548 | 2020 | 49.287864230473 | 2019 | 49.30250208552 | 2018 | 49.321175055546 | 2017 | 49.340507438258 | 2016 | 49.360628354222 | 2015 | 49.380037587405 | 2014 | 49.398757659783 | 2013 | 49.418546760117 | 2012 | 49.438843042573 | 2011 | 49.459610601205 | 2010 | 49.480333004426 | 2009 | 49.500889603522 | 2008 | 49.521499493235 | 2007 | 49.541961883354 | 2006 | 49.562018804884 | 2005 | 49.581948164695 | 2004 | 49.602126765545 | 2003 | 49.62252665832 | 2002 | 49.642826297121 | 2001 | 49.662587666305 | 2000 | 49.681461914912 | 1999 | 49.699231613177 | 1998 | 49.71597039495 | 1997 | 49.732296256573 | 1996 | 49.748685082836 | 1995 | 49.765229957265 | 1994 | 49.781998564079 | 1993 | 49.798707962976 | 1992 | 49.814558512166 | 1991 | 49.828444042593 | 1990 | 49.839765766628 | 1989 | 49.848345056099 | 1988 | 49.854237078396 | 1987 | 49.858099231449 | 1986 | 49.860849319669 | 1985 | 49.863125347308 | 1984 | 49.865021080423 | 1983 | 49.8667267144 | 1982 | 49.868612627313 | 1981 | 49.870893934547 | 1980 | 49.873807685816 | 1979 | 49.877563781025 | 1978 | 49.881853038879 | 1977 | 49.886601400774 | 1976 | 49.892361949731 | 1975 | 49.899512696418 |
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