India - Population Pyramid
From https://www.populationpyramid.net/, the estimate:
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Big Picture: Comprehensive Discussion on NFHS - 5
The National Family Health Survey 5 results: NFHS-5 web page: http://rchiips.org/nfhs/factsheet_NFHS-5.shtml
Total Population - UN World Population Prospects 2019
UN World Population Prospects 2019, Total Population Projection for India. https://population.un.org/wpp/Graphs/