对外直接投资净流出（占 GDP 的百分比） - World, Angola, Sao Tome and Principe, South Sudan, Guinea-Bissau, Mauritania, Lao PDR, Congo, Dem. Rep., Liberia, Haiti
International Monetary Fund, International Financial Statistics and Balance of Payments databases, World Bank, International Debt Statistics, and World Bank and OECD GDP estimates.
