Year | Value | 2021 | 58.741548226853 | 2020 | 58.741548226853 | 2019 | 58.276988179017 | 2018 | 58.276988179017 | 2017 | 58.123668031216 | 2016 | 58.123668031216 | 2015 | 58.123668031216 | 2014 | 58.123668031216 | 2013 | 58.123668031216 | 2012 | 58.129800837128 | 2011 | 58.131334038606 | 2010 | 58.134400441562 | 2009 | 58.132867240084 | 2008 | 58.132867240084 | 2007 | 58.129800837128 | 2006 | 58.123668031216 | 2005 | 58.134400441562 | 2004 | 58.15126565782 | 2003 | 58.083804792788 | 2002 | 57.939683853855 | 2001 | 57.947349861245 | 2000 | 57.945816659767 | 1999 | 57.899820615427 | 1998 | 58.05927356914 | 1997 | 57.947349861245 | 1996 | 57.889088205081 | 1995 | 57.898287413949 | 1994 | 57.974947487849 | 1993 | 58.160464866688 | 1992 | 58.307652208577 | 1991 | 58.307652208577 | 1990 | 58.322984223357 | 1989 | 58.322984223357 | 1988 | 58.322984223357 | 1987 | 58.330650230747 | 1986 | 58.344449044049 | 1985 | 58.344449044049 | 1984 | 58.344449044049 | 1983 | 58.344449044049 | 1982 | 58.344449044049 | 1981 | 58.342915842571 | 1980 | 58.336783036659 | 1979 | 58.336783036659 | 1978 | 58.338316238137 | 1977 | 58.338316238137 | 1976 | 58.338316238137 | 1975 | 58.33877619858 | 1974 | 58.33877619858 | 1973 | 58.337089676954 | 1972 | 58.335249835181 | 1971 | 58.316851417445 | 1970 | 58.270855373105 | 1969 | 58.255523358325 | 1968 | 58.230992134676 | 1967 | 58.229458933198 | 1966 | 58.192662097726 | 1965 | 58.123668031216 | 1964 | 58.116002023826 | 1963 | 58.031675942536 | 1962 | 57.955015868635 | 1961 | 57.878355794735 |
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