Abbreviations and data notes xix SSA Sub-Saharan Africa Region UIS UNESCO Institute for Statistics UNAIDS Joint United Nations Program on HIV/AIDS UNDP United Nations Development Programme UNESCO United Nations Educational,Scientific and Cultural Organization UN-HABITAT United Nations Human Settlements Program UNICEF United Nations Children's Fund UNIFEM United Nations Development Fund for Women UNRISD United Nations Research Institute for Social Development UN WOMEN United Nations Entity for Gender Equality and the Empowerment of Women USAID United States Agency for International Development WHO World Health Organization WINGOs women's international nongovernmental organizations DATA NOTES The countries included in regional and income groupings in this Report are listed in the Classification of Economies table at the end of the Selected World Development Indicators. Income classifications are based on GNP per capita;thresholds for income classifications in this edition may be found in the Introduction to Selected World Development Indicators. Group averages reported in the figures and tables are unweighted averages of the countries in the group,unless noted to the contrary. The use of the word countries to refer to economies implies no judgment by the World Bank about the legal or other status of a territory.The term developing countries includes low- and middle-income economies and thus may include economies in transition from central planning,as a matter of convenience.The term advanced countries may be used as a matter of convenience to denote high-income economies. Note:Dollar figures are current U.S.dollars,unless otherwise specified.Billion means 1,000 million;trillion means 1,000 billion.SSA Sub-Saharan Africa Region UIS UNESCO Institute for Statistics UNAIDS Joint United Nations Program on HIV/AIDS UNDP United Nations Development Programme UNESCO United Nations Educational, Scientifi c and Cultural Organization UN-HABITAT United Nations Human Settlements Program UNICEF United Nations Children’s Fund UNIFEM United Nations Development Fund for Women UNRISD United Nations Research Institute for Social Development UN WOMEN United Nations Entity for Gender Equality and the Empowerment of Women USAID United States Agency for International Development WHO World Health Organization WINGOs women’s international nongovernmental organizations DATA NOTES The countries included in regional and income groupings in this Report are listed in the Classifi cation of Economies table at the end of the Selected World Development Indicators. Income classifi cations are based on GNP per capita; thresholds for income classifi cations in this edition may be found in the Introduction to Selected World Development Indicators. Group averages reported in the fi gures and tables are unweighted averages of the countries in the group, unless noted to the contrary. The use of the word countries to refer to economies implies no judgment by the World Bank about the legal or other status of a territory. The term developing countries includes low￾and middle-income economies and thus may include economies in transition from central planning, as a matter of convenience. The term advanced countries may be used as a matter of convenience to denote high-income economies. Note: Dollar fi gures are current U.S. dollars, unless otherwise specifi ed. Billion means 1,000 million; trillion means 1,000 billion. Abbreviations and data notes xix