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Wikipedia is one of the most widely-known sites on the web. A free, collaborative, multilingual encyclopaedia, its 22 million articles (with four million in English alone) have been written by volunteers around the world.
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Yearly time series (1990–2011). It was last modified on 14 Mar 2014 at 14:33.
Yearly time series (1896–2012). It was last modified on 27 Feb 2014 at 14:29.
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