Year | Value | 2022 | 45.767194976696 | 2021 | 46.305324566726 | 2020 | 46.862558281621 | 2019 | 47.428519566877 | 2018 | 48.00942208058 | 2017 | 48.597599543803 | 2016 | 49.1898747397 | 2015 | 49.786389812637 | 2014 | 50.391703849173 | 2013 | 50.999946388008 | 2012 | 51.601269926724 | 2011 | 52.193664145613 | 2010 | 52.792835831217 | 2009 | 53.41618129273 | 2008 | 54.043513209878 | 2007 | 54.669229850444 | 2006 | 55.288297006687 | 2005 | 55.914128347001 | 2004 | 56.548701386121 | 2003 | 57.177339372227 | 2002 | 57.798141101636 | 2001 | 58.409892706801 | 2000 | 58.970990883276 | 1999 | 59.476831648719 | 1998 | 59.973060208323 | 1997 | 60.467451274862 | 1996 | 60.956804511807 | 1995 | 61.441385764155 | 1994 | 61.921346443232 | 1993 | 62.399975670644 | 1992 | 62.875954357788 | 1991 | 63.354483697279 | 1990 | 63.836714641316 | 1989 | 64.326357123943 | 1988 | 64.811588814498 | 1987 | 65.3103954131 | 1986 | 65.811234409336 | 1985 | 66.316640456057 | 1984 | 66.824810443902 | 1983 | 67.332851520917 | 1982 | 67.825744833364 | 1981 | 68.360508024343 | 1980 | 68.933281202237 | 1979 | 69.500567184051 | 1978 | 70.059639226782 | 1977 | 70.527736835247 | 1976 | 70.903173801368 | 1975 | 71.275026644398 | 1974 | 71.585655173714 | 1973 | 71.943294142992 | 1972 | 72.257408160162 | 1971 | 72.537263539629 | 1970 | 72.782574563254 | 1969 | 73.00358642588 | 1968 | 73.226846430825 | 1967 | 73.456263130284 | 1966 | 73.686533053203 | 1965 | 73.901237588795 | 1964 | 74.123708519044 | 1963 | 74.579675154903 | 1962 | 75.027349140018 | 1961 | 75.508955935821 | 1960 | 76.016311711064 |
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