[1] Data drawn from Conference Board and Groningen Growth and Development Centre, Total Economy Database (January 2007),, are measured in constant 1990 purchasing power parities (PPPs) converted into U.S. dollars. World Bank data are based on different conversion factors but show congruent trends.

[2] No internationally comparable data on in-country inequality are available.

[3] The growth rate of real per capita GDP is measured in constant 1990 PPPs.

[4] The estimated total is extended backwards to 1985.