Year | Value | 2022 | 49.236256524756 | 2021 | 49.259277598461 | 2020 | 49.288455588196 | 2019 | 49.308116057295 | 2018 | 49.318934205044 | 2017 | 49.328403436722 | 2016 | 49.337390846303 | 2015 | 49.346185087028 | 2014 | 49.354252929128 | 2013 | 49.362730284875 | 2012 | 49.372877185212 | 2011 | 49.383133202042 | 2010 | 49.394098833978 | 2009 | 49.407279164339 | 2008 | 49.421969146762 | 2007 | 49.43424563606 | 2006 | 49.443712341984 | 2005 | 49.453405168784 | 2004 | 49.463560511593 | 2003 | 49.474081386249 | 2002 | 49.485655104373 | 2001 | 49.497532014475 | 2000 | 49.510763888267 | 1999 | 49.524518393733 | 1998 | 49.536066309227 | 1997 | 49.547696576904 | 1996 | 49.559680850249 | 1995 | 49.57152975131 | 1994 | 49.582340487676 | 1993 | 49.594582561699 | 1992 | 49.609817340413 | 1991 | 49.625940869812 | 1990 | 49.6416453757 | 1989 | 49.656182344033 | 1988 | 49.669942633626 | 1987 | 49.683697054105 | 1986 | 49.69786597602 | 1985 | 49.711715852226 | 1984 | 49.72633627014 | 1983 | 49.74217653111 | 1982 | 49.759706016241 | 1981 | 49.77857726357 | 1980 | 49.796042944323 | 1979 | 49.813397046077 | 1978 | 49.831392201127 | 1977 | 49.848355708673 | 1976 | 49.868558032976 | 1975 | 49.891557813078 | 1974 | 49.914348278825 | 1973 | 49.937904684899 | 1972 | 49.961376531149 | 1971 | 49.986286014008 | 1970 | 50.004106190877 | 1969 | 50.013603060841 | 1968 | 50.023564434991 | 1967 | 50.033440797243 | 1966 | 50.04305269701 | 1965 | 50.053435937852 | 1964 | 50.064539917982 | 1963 | 50.075623256881 | 1962 | 50.087481578435 | 1961 | 50.101067831905 | 1960 | 50.116048259989 |
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