Year | Value | 2022 | 49.495972132722 | 2021 | 49.481057407442 | 2020 | 49.461765095665 | 2019 | 49.44843528368 | 2018 | 49.440293686243 | 2017 | 49.433734038384 | 2016 | 49.427743373002 | 2015 | 49.424728454883 | 2014 | 49.425141134905 | 2013 | 49.425825988069 | 2012 | 49.426261589513 | 2011 | 49.427365478535 | 2010 | 49.428631158442 | 2009 | 49.429656331103 | 2008 | 49.430561033779 | 2007 | 49.432461653549 | 2006 | 49.435677360116 | 2005 | 49.439078077244 | 2004 | 49.442985698315 | 2003 | 49.447984014294 | 2002 | 49.453562453619 | 2001 | 49.459562639755 | 2000 | 49.468261070487 | 1999 | 49.478889938832 | 1998 | 49.488488753758 | 1997 | 49.498903431084 | 1996 | 49.508316038476 | 1995 | 49.514423895371 | 1994 | 49.519528364545 | 1993 | 49.523360784579 | 1992 | 49.526362491941 | 1991 | 49.532773412476 | 1990 | 49.541718583085 | 1989 | 49.551386828132 | 1988 | 49.560299319867 | 1987 | 49.568267005469 | 1986 | 49.575547264489 | 1985 | 49.575246341239 | 1984 | 49.569266642636 | 1983 | 49.564199447008 | 1982 | 49.560575200942 | 1981 | 49.561741118606 | 1980 | 49.566295721054 | 1979 | 49.568846167325 | 1978 | 49.571365326693 | 1977 | 49.576823599315 | 1976 | 49.581061586145 | 1975 | 49.586742281182 | 1974 | 49.598075713709 | 1973 | 49.612439002598 | 1972 | 49.628316808297 | 1971 | 49.644895694507 | 1970 | 49.654831038464 | 1969 | 49.66060976605 | 1968 | 49.669686639666 | 1967 | 49.677904089469 | 1966 | 49.685605574972 | 1965 | 49.693256659645 | 1964 | 49.700492241911 | 1963 | 49.711175276921 | 1962 | 49.722527095106 | 1961 | 49.727629400431 | 1960 | 49.725464398064 |
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