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What is the DEC conversion factor?

When we convert local currency national accounts data (e.g., Gross Domestic Product) into U.S. dollars, we use the series labeled "DEC alternative conversion factor" rather than the official exchange rate. As a rule, it is the same as the official exchange rate reported in the IMF's International Financial Statistics (IFS), except where further refinements are made by World Bank staff when official exchange rates are deemed to be unreliable or unrepresentative of the effective exchange rate during a period. 

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