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Data cited at: The African Development Bank: The Middle of the Pyramid: Dynamics of the Middle Class in Africa: https://www.afdb.org/fileadmin/uploads/afdb/Documents/Publications/The%20Middle%20of%20the%20Pyramid_The%20Middle%20of%20the%20Pyramid.pdf

This dataset covers the topics of Urban population and proportion of urban population living in slum area across countries & regions for the year of 1990-2014

Data Cited at - Sachs, J., Schmidt-Traub, G., Kroll, C., Lafortune, G., Fuller, G. (2019): Sustainable Development Report 2019. New York: Bertelsmann Stiftung and Sustainable Development Solutions Network (SDSN). The Sustainable Development Report 2020 presents the SDG Index and Dashboards for all UN member states and frames the implementation of the Sustainable Development Goals (SDGs) in terms of six broad transformations. It was prepared by teams of independent experts at the Sustainable Development Solutions Network (SDSN) and the Bertelsmann Stiftung.

The series is part of the ILO modelled estimates and is harmonized to account for differences in national data and scope of coverage, collection and tabulation methodologies as well as for other country-specific factors. The working poverty rate conveys the percentage of employed persons living in poverty in spite of being employed. Poverty is defined using the international poverty line of US$1.90 per day in purchasing power parity (PPP). For more information, refer to the Labour Market-related SDG Indicators (ILOSDG) database description.

The primary World Bank collection of development indicators, compiled from officially-recognized international sources. It presents the most current and accurate global development data available, and includes national, regional and global estimates

World's Women 2020: Trends and Statistics. Themes: Population and families