Sources:

https://cepr.org/voxeu/columns/debating-defence-budgets-why-military-purchasing-power-parity-matters (Brief explanation of what Military PPP is and why it gives a more accurate picture than nominal defense budgets, for the few Countries the data is obtainable from)

https://databank.worldbank.org/ (GDP, GDP-PPP, Mil. Exp, and Mil. Exp %GDP figures)

https://www.researchgate.net/publication/354697825_The_Real_Military_Balance_International_Comparisons_of_Defense_Spending

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