Year | Value | 2022 | 49.543370605957 | 2021 | 49.529482946219 | 2020 | 49.516899905777 | 2019 | 49.504585165426 | 2018 | 49.491175047531 | 2017 | 49.47738193902 | 2016 | 49.464226362072 | 2015 | 49.453262483836 | 2014 | 49.449531148145 | 2013 | 49.451800734952 | 2012 | 49.449021313603 | 2011 | 49.446986435831 | 2010 | 49.450086275717 | 2009 | 49.45098252167 | 2008 | 49.450272970578 | 2007 | 49.448163184322 | 2006 | 49.449060650805 | 2005 | 49.452503489336 | 2004 | 49.455913711813 | 2003 | 49.46245288812 | 2002 | 49.464262907667 | 2001 | 49.456693562413 | 2000 | 49.446267581295 | 1999 | 49.438744941489 | 1998 | 49.434953555049 | 1997 | 49.439870254851 | 1996 | 49.45375570569 | 1995 | 49.460958580351 | 1994 | 49.461896094317 | 1993 | 49.465636334691 | 1992 | 49.470938131272 | 1991 | 49.473599151257 | 1990 | 49.474019290441 | 1989 | 49.47242360847 | 1988 | 49.462040269823 | 1987 | 49.444274868813 | 1986 | 49.421699952861 | 1985 | 49.400802856816 | 1984 | 49.385196249639 | 1983 | 49.367416411095 | 1982 | 49.342657187811 | 1981 | 49.366026186024 | 1980 | 49.404490975143 | 1979 | 49.40367233168 | 1978 | 49.407649580363 | 1977 | 49.413166568971 | 1976 | 49.408748369281 | 1975 | 49.399488380337 | 1974 | 49.392846123002 | 1973 | 49.379418759649 | 1972 | 49.365304410154 | 1971 | 49.357121725048 | 1970 | 49.352420929899 | 1969 | 49.349123183165 | 1968 | 49.347737190355 | 1967 | 49.348270872297 | 1966 | 49.349360602102 | 1965 | 49.365593580967 | 1964 | 49.396684876212 | 1963 | 49.424208583448 | 1962 | 49.447432402023 | 1961 | 49.469469998003 | 1960 | 49.481735148352 |
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