The Global Financial Inclusion (Global Findex) database, provides comparable indicators showing how people around the world save, borrow,make payments, and manage risk. The survey is conducted as part of the Gallup World Poll which targets a nationally representative, randomly selected sample from the non institutionalized population at or above the age of 15.
Demirgüç-Kunt, Asli, and Leora Klapper. “Measuring Financial Inclusion: The Global Findex.” World Bank Policy Research Working Paper , no. WPS 6025 (2012).