23 April 2012 | Updated on 18 March 2016
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<p>source: Simon Rogers, the guardian<br />
<a href="http://www.guardian.co.uk/news/datablog/graphic/2012/jan/26/how-africa-…; title="http://www.guardian.co.uk/news/datablog/graphic/2012/jan/26/how-africa-…;