Year | Value | 2022 | 50.088317315705 | 2021 | 50.067618147184 | 2020 | 50.023597677927 | 2019 | 49.994833870895 | 2018 | 49.989333362796 | 2017 | 49.986662229927 | 2016 | 49.985811685636 | 2015 | 49.985947062411 | 2014 | 49.986101009939 | 2013 | 49.985368558103 | 2012 | 49.983108242293 | 2011 | 49.979051995153 | 2010 | 49.972917862636 | 2009 | 49.96527110313 | 2008 | 49.957269871407 | 2007 | 49.949813480159 | 2006 | 49.943468730702 | 2005 | 49.938307969521 | 2004 | 49.934179771789 | 2003 | 49.93064527188 | 2002 | 49.92725281584 | 2001 | 49.923720493704 | 2000 | 49.919752153149 | 1999 | 49.915348364001 | 1998 | 49.910772344845 | 1997 | 49.906138204403 | 1996 | 49.901229030011 | 1995 | 49.89584128885 | 1994 | 49.890056550906 | 1993 | 49.883987259662 | 1992 | 49.877673369664 | 1991 | 49.871213356866 | 1990 | 49.864682099826 | 1989 | 49.858185723373 | 1988 | 49.852042992288 | 1987 | 49.846793874551 | 1986 | 49.843046898577 | 1985 | 49.840976816102 | 1984 | 49.840113780604 | 1983 | 49.840055671563 | 1982 | 49.840626077925 | 1981 | 49.841905552306 | 1980 | 49.844005140216 | 1979 | 49.846979926765 | 1978 | 49.850882659006 | 1977 | 49.855868085228 | 1976 | 49.862102700734 | 1975 | 49.869571079118 | 1974 | 49.878058891442 | 1973 | 49.887678535477 | 1972 | 49.898678070231 | 1971 | 49.910800662075 | 1970 | 49.923892800235 | 1969 | 49.93802772936 | 1968 | 49.953215625415 | 1967 | 49.969161144244 | 1966 | 49.985652578415 | 1965 | 50.002688599644 | 1964 | 50.020305663418 | 1963 | 50.038297022009 | 1962 | 50.05675375862 | 1961 | 50.07558654549 | 1960 | 50.094539857666 |
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