Year | Value | 2022 | 48.124038367258 | 2021 | 48.083811264209 | 2020 | 48.052806953365 | 2019 | 48.019724374059 | 2018 | 47.974439018801 | 2017 | 47.925662799524 | 2016 | 47.870413080073 | 2015 | 47.817753499415 | 2014 | 47.773582507527 | 2013 | 47.727717688709 | 2012 | 47.686609681279 | 2011 | 47.646632355202 | 2010 | 47.603209004274 | 2009 | 47.564318300607 | 2008 | 47.536140023191 | 2007 | 47.517327105055 | 2006 | 47.510938049446 | 2005 | 47.518837207995 | 2004 | 47.531256275398 | 2003 | 47.545326136987 | 2002 | 47.56030117551 | 2001 | 47.582287746089 | 2000 | 47.611056340427 | 1999 | 47.646830758925 | 1998 | 47.731283201116 | 1997 | 47.848187710677 | 1996 | 47.951000749679 | 1995 | 48.027043886928 | 1994 | 48.086107302669 | 1993 | 48.129834118948 | 1992 | 48.142840135872 | 1991 | 48.133194757238 | 1990 | 48.110785819257 | 1989 | 48.080858220054 | 1988 | 48.126019820347 | 1987 | 48.239201198471 | 1986 | 48.330464505805 | 1985 | 48.351279397067 | 1984 | 48.310827002843 | 1983 | 48.276369837201 | 1982 | 48.25379681361 | 1981 | 48.239774831426 | 1980 | 48.22872972071 | 1979 | 48.219521779765 | 1978 | 48.21081241117 | 1977 | 48.201305997163 | 1976 | 48.197284719747 | 1975 | 48.202978628525 | 1974 | 48.214603557048 | 1973 | 48.228281737625 | 1972 | 48.24350973125 | 1971 | 48.265259268914 | 1970 | 48.284955001119 | 1969 | 48.295649782379 | 1968 | 48.301875834883 | 1967 | 48.305603195759 | 1966 | 48.309097118231 | 1965 | 48.309414401865 | 1964 | 48.305314715397 | 1963 | 48.298389050564 | 1962 | 48.287067893754 | 1961 | 48.273692431257 | 1960 | 48.263552035065 |
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