GDP at market prices is the sum of gross value added by all resident producers in the economy plus any product taxes and minus any subsidies not included in the value of the products. It is calculated without making deductions for depreciation of fabricated assets or for depletion and degradation of natural resources. GDP in US dollars, is obtained by converting GDP ?gures in national currency using the average of?cial exchange rates provided by the World Bank and the IMF. For a few countries where the offcial exchange rate does not effectively re?ect the rate applied to actual foreign exchange transactions, an alternative conversion factor is used. Data at constant 200 prices and exchange rates. (constant 2000 US$).. Source: national sources, international sources (UN, Wbank, IMF) and ADB estimates.