Year | Value | 2022 | 49.903668606226 | 2021 | 49.913336993182 | 2020 | 49.927118481723 | 2019 | 49.943834413142 | 2018 | 49.963213997055 | 2017 | 49.984336167827 | 2016 | 50.006904921233 | 2015 | 50.030984791338 | 2014 | 50.056816661648 | 2013 | 50.084840712677 | 2012 | 50.11434901945 | 2011 | 50.141707397819 | 2010 | 50.16501671129 | 2009 | 50.188606962061 | 2008 | 50.213827724545 | 2007 | 50.245502853282 | 2006 | 50.282143771397 | 2005 | 50.293622158831 | 2004 | 50.304361715684 | 2003 | 50.338925382363 | 2002 | 50.372797483457 | 2001 | 50.405675730351 | 2000 | 50.435644467016 | 1999 | 50.466761207668 | 1998 | 50.501451736685 | 1997 | 50.543570669667 | 1996 | 50.592518206407 | 1995 | 50.638277181667 | 1994 | 50.674106770544 | 1993 | 50.717143392402 | 1992 | 50.761463731211 | 1991 | 50.79122682856 | 1990 | 50.820184364456 | 1989 | 50.84868907239 | 1988 | 50.876661760104 | 1987 | 50.900819337709 | 1986 | 50.92141244132 | 1985 | 50.941566022981 | 1984 | 50.95849823087 | 1983 | 50.974775178196 | 1982 | 50.996193010777 | 1981 | 51.022016866887 | 1980 | 51.049455925094 | 1979 | 51.077565766101 | 1978 | 51.108312044757 | 1977 | 51.14627174073 | 1976 | 51.192531114816 | 1975 | 51.243894476667 | 1974 | 51.299618692893 | 1973 | 51.359368899851 | 1972 | 51.422629774098 | 1971 | 51.488951654605 | 1970 | 51.558107759928 | 1969 | 51.630742754712 | 1968 | 51.702871001076 | 1967 | 51.775250822948 | 1966 | 51.850936764203 | 1965 | 51.929697720227 | 1964 | 52.0127389626 | 1963 | 52.096978031767 | 1962 | 52.182699893803 | 1961 | 52.271818615123 | 1960 | 52.361556257175 |
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