Year | Value | 2022 | 49.461185838029 | 2021 | 49.472190947945 | 2020 | 49.481838935209 | 2019 | 49.494062334835 | 2018 | 49.510399144205 | 2017 | 49.5271210052 | 2016 | 49.54495761634 | 2015 | 49.562195677472 | 2014 | 49.576277639966 | 2013 | 49.589145865727 | 2012 | 49.602628077911 | 2011 | 49.617578158889 | 2010 | 49.633414699397 | 2009 | 49.64996369825 | 2008 | 49.666790491029 | 2007 | 49.680438918282 | 2006 | 49.69076302238 | 2005 | 49.69725901188 | 2004 | 49.702632075872 | 2003 | 49.709314093701 | 2002 | 49.716573218471 | 2001 | 49.726999057444 | 2000 | 49.737588283475 | 1999 | 49.74626921223 | 1998 | 49.755470724714 | 1997 | 49.762381849258 | 1996 | 49.762696865663 | 1995 | 49.760612144034 | 1994 | 49.76451106143 | 1993 | 49.770182990658 | 1992 | 49.772027512515 | 1991 | 49.770600220954 | 1990 | 49.774698131604 | 1989 | 49.78776431449 | 1988 | 49.800059140158 | 1987 | 49.81049685881 | 1986 | 49.818882377357 | 1985 | 49.826917430684 | 1984 | 49.841644486158 | 1983 | 49.857836489872 | 1982 | 49.867817476304 | 1981 | 49.87898100212 | 1980 | 49.889320209297 | 1979 | 49.898428002581 | 1978 | 49.908844598917 | 1977 | 49.921047045521 | 1976 | 49.93786491343 | 1975 | 49.959609435043 | 1974 | 49.985392736716 | 1973 | 50.013406493091 | 1972 | 50.040114254804 | 1971 | 50.064812713637 | 1970 | 50.086767389973 | 1969 | 50.093764342839 | 1968 | 50.085061828183 | 1967 | 50.070122485829 | 1966 | 50.066765586777 | 1965 | 50.076382352939 | 1964 | 50.081498136209 | 1963 | 50.085989734261 | 1962 | 50.092220842643 | 1961 | 50.097073400584 | 1960 | 50.10101196256 |
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