In most countries, a majority of the population belongs to one of the large religions, and this guides which chart the country shows up in. However, in many countries there is no clear majority. In Nigeria, for example, 49 percent of the population was Christian and 48 percent Muslim in 2010 according to our data on religion, Pew[2,3]. We have split 81 such countries into three separate bubbles in the relevant charts, using Pew and USAID-DHS to estimate each religious group’s fertility rate, and roughly estimating each religious group’s per capita income based on GDL[1,2], OECD and other sources.
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