抚养比（占劳动年龄人口的百分比） - Low income, Sierra Leone
World Bank staff estimates using the World Bank's population and age distributions of the United Nations Population Division's World Population Prospects. The World Bank's population estimates are from various sources including the United Nations Population Division's World Population Prospects; census reports and statistical publications from national statistical offices; Eurostat's Demographic Statistics; United Nations Statistical Division, Population and Vital Statistics Report ( various years ); U.S. Census Bureau: International Database; and Secretariat of the Pacific Community, Statistics and Demography Programme.
