Year | Value | 2022 | 49.634490753814 | 2021 | 49.6193705566 | 2020 | 49.602158019386 | 2019 | 49.588219883496 | 2018 | 49.576496808444 | 2017 | 49.565749270378 | 2016 | 49.554904494141 | 2015 | 49.545200068027 | 2014 | 49.539894511452 | 2013 | 49.536905245893 | 2012 | 49.533599330415 | 2011 | 49.530689825916 | 2010 | 49.527745178926 | 2009 | 49.523986695764 | 2008 | 49.519085097578 | 2007 | 49.515026883752 | 2006 | 49.51237066372 | 2005 | 49.51017243543 | 2004 | 49.509322826843 | 2003 | 49.509865701064 | 2002 | 49.511190728473 | 2001 | 49.513152212698 | 2000 | 49.51728179863 | 1999 | 49.522934961809 | 1998 | 49.527701633167 | 1997 | 49.53328100147 | 1996 | 49.538229549758 | 1995 | 49.540690367152 | 1994 | 49.543296299778 | 1993 | 49.545809531319 | 1992 | 49.547901095758 | 1991 | 49.552988034723 | 1990 | 49.560551973604 | 1989 | 49.568454469144 | 1988 | 49.57443513876 | 1987 | 49.578890888166 | 1986 | 49.583479097605 | 1985 | 49.581973559797 | 1984 | 49.575358360761 | 1983 | 49.569103058611 | 1982 | 49.564233335941 | 1981 | 49.563447195154 | 1980 | 49.567325860429 | 1979 | 49.568783241498 | 1978 | 49.566917459176 | 1977 | 49.567798538894 | 1976 | 49.568782396498 | 1975 | 49.570469939038 | 1974 | 49.57799243722 | 1973 | 49.589740109962 | 1972 | 49.602412115895 | 1971 | 49.609730068157 | 1970 | 49.611326724487 | 1969 | 49.615254301986 | 1968 | 49.621633666177 | 1967 | 49.627113416603 | 1966 | 49.632244336949 | 1965 | 49.637147089532 | 1964 | 49.641461651143 | 1963 | 49.648706407912 | 1962 | 49.656466547258 | 1961 | 49.658752170063 | 1960 | 49.654646605887 |
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