Year | Value | 2023 | 49.577646076172 | 2022 | 49.587545818471 | 2021 | 49.599152373826 | 2020 | 49.613007017811 | 2019 | 49.625428259132 | 2018 | 49.63526802832 | 2017 | 49.645207192364 | 2016 | 49.655086676458 | 2015 | 49.665004430017 | 2014 | 49.674933206478 | 2013 | 49.683547838448 | 2012 | 49.690973956992 | 2011 | 49.697593291705 | 2010 | 49.70427368068 | 2009 | 49.71147348189 | 2008 | 49.719849361624 | 2007 | 49.729396576664 | 2006 | 49.738245591074 | 2005 | 49.746713109548 | 2004 | 49.754213355638 | 2003 | 49.757411935062 | 2002 | 49.754516864553 | 2001 | 49.745952680689 | 2000 | 49.733714429466 | 1999 | 49.720388059949 | 1998 | 49.706228471173 | 1997 | 49.690466302579 | 1996 | 49.675406301236 | 1995 | 49.662598685146 | 1994 | 49.652151712914 | 1993 | 49.642732134572 | 1992 | 49.652401718822 | 1991 | 49.667877266706 | 1990 | 49.666372754897 | 1989 | 49.657975290148 | 1988 | 49.648623491558 | 1987 | 49.638202632934 | 1986 | 49.627294519423 | 1985 | 49.617073267642 | 1984 | 49.608257193669 | 1983 | 49.600192665193 | 1982 | 49.591320356085 | 1981 | 49.581544219888 | 1980 | 49.572303300953 | 1979 | 49.564058020511 | 1978 | 49.555227814063 | 1977 | 49.546566750323 | 1976 | 49.538218837898 | 1975 | 49.528841206624 | 1974 | 49.52080326456 |
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