The GDPs of all countries are from Summers, Robert and Heston, Alan, “A fresh Set of International Comparisons of Actual Solution and Rate Level Estimates for 130 Nations, 1950–1985,” Assessment of Money and Wealth 34 (03 1988), pp. 1–26CrossRefGoogle Scholar. These estimates are according to buying electricity parities (PPPs), https://anatolo233xly0.blog-ezine.com/profile