Nigeria has achieved consistently high growth over the past decade, including 7.4% in 2011 and 6.6% in 2012, according to the African Development Bank. This expansion makes Nigeria one of the continent’s most consistent performers, with over twice South Africa’s average growth. The IMF forecasts economic growth of 7.2% in 2013 and 7% in 2014. Non-oil GDP is expected to rise 8.5% in 2013,...