Year | Value | 2022 | 50.456628678539 | 2021 | 50.470517053781 | 2020 | 50.483100339919 | 2019 | 50.495415084216 | 2018 | 50.508825206401 | 2017 | 50.522617802684 | 2016 | 50.535773637928 | 2015 | 50.546736981215 | 2014 | 50.550469124645 | 2013 | 50.548199821789 | 2012 | 50.55097925416 | 2011 | 50.553012985946 | 2010 | 50.549912840701 | 2009 | 50.54901747833 | 2008 | 50.549726723332 | 2007 | 50.551837751465 | 2006 | 50.55093998497 | 2005 | 50.547497482707 | 2004 | 50.544085627487 | 2003 | 50.53754711188 | 2002 | 50.535737435105 | 2001 | 50.543306786571 | 2000 | 50.553733130507 | 1999 | 50.561254332581 | 1998 | 50.565048665838 | 1997 | 50.560129745149 | 1996 | 50.546243909173 | 1995 | 50.53904024077 | 1994 | 50.538104708257 | 1993 | 50.534365713251 | 1992 | 50.529061031799 | 1991 | 50.526401277606 | 1990 | 50.525980268774 | 1989 | 50.52757729839 | 1988 | 50.537960196175 | 1987 | 50.555724172816 | 1986 | 50.578299553686 | 1985 | 50.599198160266 | 1984 | 50.614804799014 | 1983 | 50.632584129937 | 1982 | 50.657342812189 | 1981 | 50.633973813976 | 1980 | 50.595509024857 | 1979 | 50.59632766832 | 1978 | 50.592351052189 | 1977 | 50.586832781354 | 1976 | 50.591249619844 | 1975 | 50.600511619663 | 1974 | 50.607154589023 | 1973 | 50.620580509004 | 1972 | 50.634695589846 | 1971 | 50.642875962063 | 1970 | 50.647579070101 | 1969 | 50.650877630019 | 1968 | 50.65226030352 | 1967 | 50.651730844171 | 1966 | 50.650636752632 | 1965 | 50.634404607963 | 1964 | 50.603318842046 | 1963 | 50.575790462517 | 1962 | 50.55257053455 | 1961 | 50.530528998186 | 1960 | 50.51826588067 |
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