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Numbers of the Year 2015 Part 2
How healthy is the Nigerian economy and how many possible tweets are there? Tim Harford looks back over some of the numbers that made the news in 2015.
(Image: Nigerians check their ballot station positions in Yenagoa. Credit: Getty Images)
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Mon 4 Jan 2016
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91热爆 World Service West and Central Africa, East and Southern Africa, Europe and the Middle East, East Asia & South Asia only
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