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The population of Africa has grown rapidly over the past century,〔Zinkina J., Korotayev A. (Explosive Population Growth in Tropical Africa: Crucial Omission in Development Forecasts (Emerging Risks and Way Out). ''World Futures'' 70/2 (2014): 120–139 ).〕 and consequently shows a large youth bulge, further reinforced by a low life expectancy of below 50 years in some African countries.〔See List of countries by life expectancy; according to the 2012 CIA Factbook, 4 of 53 countries show a life expectancy at birth below 50 years〕 The population doubled in the period 1982–2009 and quadrupled from 1955–2009, according to United Nations estimates.〔("World Population Prospects: The 2004 Revision" ) United Nations (Department of Economic and Social Affairs, population division)〕 As of 2013, the total population of Africa is estimated at 1.1 billion, representing approximately 15% of the world's population.〔2013 World Population Data Sheet, (Prb,org )〕 ==Health== More than 40% of the population is below 15 years old in most sub-Saharan countries, as well as the Sudan but with the exception of South Africa,〔According to the CIA Factbook: Angola, Benin, Burundi, Burkina Faso, the Central African Republic, Cameroon, Chad, the Republic of Congo, the Democratic Republic of Congo, Djibouti, Equatorial Guinea, Eritrea, Ethiopia, Gabon, the Gambia, Ghana, Guinea, Guinea-Bissau, Kenya, Liberia, Madagascar, Malawi, Mali, Mauritania, Mozambique, Namibia, Nigeria, Rwanda, Senegal, Sierra Leone, Somalia, Sudan, Swaziland, Tanzania, Togo, Uganda, and Zambia〕 in Uganda as many as 50% (as compared to 20% in the USA). Infant mortality is high, with as many as 110 deaths per 1,000 live births in Niger, and between 25% and 50% malnourished in Tanzania, Kenya, Sudan, Mozambique, Madagascar, Zimbabwe, Zambia, Angola and other countries. Thirty-four out of fifty-three African countries are counted among the world's Least Developed Countries. HIV/AIDS is widespread in sub-Saharan Africa, with some 11% of adult population infected and an estimated 2 million deaths caused by AIDS in 2005. Image:Africa HIV-AIDS.svg|HIV infection is widespread in most of sub-Saharan Africa (ca. 7%, as opposed to 1% worldwide), with incidences above 30% in Botswana, Zimbabwe and Swaziland. Image:Life expectancy in select Southern African countries 1960-2012.svg|Life expectancy has fallen drastically in Southern Africa since the 1990s as a result of HIV. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Demographics of Africa」の詳細全文を読む スポンサード リンク
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