Notes on country data.

• Position: Africa - Uni - Brief article

Head of government: The person most responsible for running the government. Many countries have both a head of government and a head of state. For example, Queen Elizabeth II is the head of state in the United Kingdom (U.K.), but Prime Minister David Cameron runs the government.

Literacy rate: Experts question some of the estimates provided. A single number means a gender breakdown is not available.

Per capita...