3. Nigeria – 16,000 Millionaires
Nigeria recently overtook South Africa as Africa’s largest economy. As the most populous country in Africa at 177.2 million, the country is home to 16,000 millionaires, over a 300 percent increase since 2000, according to Business Insider. Oil has been a dominant source of government revenues since the 1970s, but Nigeria’s economy is also driven by a growth in agriculture, telecommunications and services.