Year | Value | 2022 | 49.581799254244 | 2021 | 49.566050485707 | 2020 | 49.547699328206 | 2019 | 49.532798330353 | 2018 | 49.520413693287 | 2017 | 49.50897305663 | 2016 | 49.497138280739 | 2015 | 49.486465512824 | 2014 | 49.480600776968 | 2013 | 49.477248183985 | 2012 | 49.473439583051 | 2011 | 49.469948148512 | 2010 | 49.46642334225 | 2009 | 49.462113529842 | 2008 | 49.456587677463 | 2007 | 49.451956220305 | 2006 | 49.448839070889 | 2005 | 49.446147053724 | 2004 | 49.444784675777 | 2003 | 49.44483639811 | 2002 | 49.445863243957 | 2001 | 49.447712215023 | 2000 | 49.451890852822 | 1999 | 49.458230909527 | 1998 | 49.464202280038 | 1997 | 49.470622482344 | 1996 | 49.476105900071 | 1995 | 49.478992134923 | 1994 | 49.48229958921 | 1993 | 49.485644782275 | 1992 | 49.488049046974 | 1991 | 49.492876469118 | 1990 | 49.500145826304 | 1989 | 49.508022241455 | 1988 | 49.514117130588 | 1987 | 49.518800637743 | 1986 | 49.52335569385 | 1985 | 49.52135367495 | 1984 | 49.514179453703 | 1983 | 49.507689945487 | 1982 | 49.502487563445 | 1981 | 49.501189499694 | 1980 | 49.504499041 | 1979 | 49.505208442932 | 1978 | 49.502716529378 | 1977 | 49.503087674509 | 1976 | 49.503403523239 | 1975 | 49.504471909962 | 1974 | 49.511690053973 | 1973 | 49.523614520156 | 1972 | 49.536886738377 | 1971 | 49.54442396447 | 1970 | 49.54568476758 | 1969 | 49.549410532642 | 1968 | 49.555725215815 | 1967 | 49.561122823825 | 1966 | 49.566183465217 | 1965 | 49.57096231686 | 1964 | 49.575103675693 | 1963 | 49.582332175272 | 1962 | 49.589992880302 | 1961 | 49.592006900909 | 1960 | 49.587709391297 |
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