Year | Value | 2022 | 49.245772562202 | 2021 | 49.268412063114 | 2020 | 49.297247138822 | 2019 | 49.318580232213 | 2018 | 49.330737141466 | 2017 | 49.340344085111 | 2016 | 49.350467267657 | 2015 | 49.360185695433 | 2014 | 49.36886509609 | 2013 | 49.377828742893 | 2012 | 49.388158629106 | 2011 | 49.398505724425 | 2010 | 49.409671195876 | 2009 | 49.423106031687 | 2008 | 49.43810298921 | 2007 | 49.450801652896 | 2006 | 49.460667018576 | 2005 | 49.470649438287 | 2004 | 49.481146825001 | 2003 | 49.492116417395 | 2002 | 49.503927450399 | 2001 | 49.516047741831 | 2000 | 49.529342730119 | 1999 | 49.542616028223 | 1998 | 49.553638241703 | 1997 | 49.564685282315 | 1996 | 49.576051967329 | 1995 | 49.587344629855 | 1994 | 49.597735686621 | 1993 | 49.609245438519 | 1992 | 49.623093702682 | 1991 | 49.637690085741 | 1990 | 49.651997820117 | 1989 | 49.665469157227 | 1988 | 49.678322278772 | 1987 | 49.690952535566 | 1986 | 49.704016097751 | 1985 | 49.717005472285 | 1984 | 49.730940220087 | 1983 | 49.746176912933 | 1982 | 49.762908079668 | 1981 | 49.780733202952 | 1980 | 49.797297194164 | 1979 | 49.81387121085 | 1978 | 49.831162776538 | 1977 | 49.847614000022 | 1976 | 49.866851078303 | 1975 | 49.888793568092 | 1974 | 49.910772229558 | 1973 | 49.933693901317 | 1972 | 49.956921035232 | 1971 | 49.981234360661 | 1970 | 49.998799635826 | 1969 | 50.009070143903 | 1968 | 50.020109645145 | 1967 | 50.03135945521 | 1966 | 50.042768843717 | 1965 | 50.055006738025 | 1964 | 50.067920577737 | 1963 | 50.080980865379 | 1962 | 50.094705531143 | 1961 | 50.109743292877 | 1960 | 50.125734459608 |
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