The figure is the result of a series of inquiries conducted by independent institutions, including the Economist's Intelligence Unit, the Merchant International Group, Freedom House, the World Economic Forum and the World Market Research Centre.
Konačna je brojka rezultat niza istraživanja nezavisnih institucija, uključujući Economist Intelligence Unit, Merchant International Group, Freedom House, Svjetski gospodarski forum i Svjetski centar za istraživanje tržišta.