Derivation
2016 constant US dollar equivalents of variables: monetary variables with the extension “USD2016" are 2016 constant US dollar counterparts to the monetary variables expressed in original currencies. The conversion allows for direct comparison of costs across corridors with different currencies. 2016 constant US dollar values are placed right by their original currency values in the dataset. Construction of the variables includes two steps. First, exchange rate between the two currencies in appropriate year was applied. Second, nominal dollar values were converted to constant 2016 dollar values using the US consumer price indexes (CPIs). World Development Indicators database served as a source of both exchange rates and inflation data.