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In page Lagos:

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Lagos is indigenous to the Yoruba people, and the Yoruba language is widely spoken. It is, by most estimates, one of the fastest-growing cities in the world.[10] Lagos is experiencing a population increase of about 275,000 persons per annum due to the influx of people from other regions for economic purposes. In 1999, the United Nations predicted that the city's metropolitan area, which had only about 290,000 inhabitants in 1950, would exceed 20 million by 2010 and thus become one of the ten most populous cities in the world.[citation needed][11]