Year | Value | 2022 | 48.930730716461 | 2021 | 48.895362968404 | 2020 | 48.858726087111 | 2019 | 48.820244100753 | 2018 | 48.778428459804 | 2017 | 48.735680997886 | 2016 | 48.692508418687 | 2015 | 48.645511849694 | 2014 | 48.595468283234 | 2013 | 48.541123376887 | 2012 | 48.483146367999 | 2011 | 48.436134410243 | 2010 | 48.396692181835 | 2009 | 48.35233140812 | 2008 | 48.303597752442 | 2007 | 48.250036122433 | 2006 | 48.19112398984 | 2005 | 48.126247535119 | 2004 | 48.053772054651 | 2003 | 47.974122758285 | 2002 | 47.951579887309 | 2001 | 48.028372285258 | 2000 | 48.141643595324 | 1999 | 48.257332119621 | 1998 | 48.380514855688 | 1997 | 48.432304663839 | 1996 | 48.405914070562 | 1995 | 48.376944403952 | 1994 | 49.141669754845 | 1993 | 49.685264790493 | 1992 | 49.725826959383 | 1991 | 49.757984610886 | 1990 | 49.782526193442 | 1989 | 49.796764872009 | 1988 | 49.805384690051 | 1987 | 49.81798083057 | 1986 | 49.830234953224 | 1985 | 49.839294741518 | 1984 | 49.846955345039 | 1983 | 49.853022393434 | 1982 | 49.857400626227 | 1981 | 49.861153120031 | 1980 | 49.865975090766 | 1979 | 49.871097400389 | 1978 | 49.873861046621 | 1977 | 49.8719490422 | 1976 | 49.864539165317 | 1975 | 49.850479078143 | 1974 | 49.831899687418 | 1973 | 49.81145603552 | 1972 | 49.790851534936 | 1971 | 49.77044645332 | 1970 | 49.748650473633 | 1969 | 49.725758818639 | 1968 | 49.702212719244 | 1967 | 49.678303269144 | 1966 | 49.654284918704 | 1965 | 49.630371336824 | 1964 | 49.607585395448 | 1963 | 49.596670459256 | 1962 | 49.584769855393 | 1961 | 49.559943465848 | 1960 | 49.533403772282 |
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