Year | Value | 2022 | 61.960233196783 | 2021 | 62.097364455516 | 2020 | 62.297753793819 | 2019 | 62.469314437005 | 2018 | 62.661798916186 | 2017 | 62.615026832158 | 2016 | 62.215312759592 | 2015 | 61.792309465533 | 2014 | 61.832276487377 | 2013 | 62.398339347834 | 2012 | 62.486621782799 | 2011 | 62.191510935361 | 2010 | 62.126898722443 | 2009 | 61.988057175657 | 2008 | 61.671393434281 | 2007 | 61.320651359113 | 2006 | 60.918390782106 | 2005 | 60.447755402081 | 2004 | 59.890503460911 | 2003 | 59.378019571966 | 2002 | 59.12438997012 | 2001 | 59.040721280316 | 2000 | 58.97458963626 | 1999 | 58.920323117089 | 1998 | 58.873668369805 | 1997 | 58.829865638642 | 1996 | 58.784744830551 | 1995 | 58.737482339045 | 1994 | 58.687509903009 | 1993 | 58.635654591245 | 1992 | 58.582430068354 | 1991 | 58.529365071953 | 1990 | 58.533139550615 | 1989 | 58.595700201259 | 1988 | 58.659072241521 | 1987 | 58.723436177167 | 1986 | 58.787283760851 | 1985 | 58.846158273381 | 1984 | 58.896943587688 | 1983 | 58.93589477533 | 1982 | 58.961630824235 | 1981 | 58.948414275495 | 1980 | 58.811345992085 | 1979 | 58.568721390724 | 1978 | 58.302207233343 | 1977 | 58.005245182139 | 1976 | 57.670541653891 | 1975 | 57.291418229773 | 1974 | 56.856854637564 | 1973 | 56.359690139967 | 1972 | 55.790625269903 | 1971 | 55.246502043361 | 1970 | 55.063242793916 | 1969 | 55.187451545022 | 1968 | 55.317100013757 | 1967 | 55.452966093424 | 1966 | 55.597706751617 | 1965 | 55.744202433009 | 1964 | 55.805602748316 | 1963 | 55.779333040564 | 1962 | 55.743284167537 | 1961 | 55.710606695814 | 1960 | 55.679534012484 |
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