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Gross domestic product (GDP) is presented in real 2005 dollars, while exchange rates are
expressed in foreign currency per U.S. dollar.
Data Sources and Derivations
The GDP series starts with the 2005 U.S. dollar GDP series derived from the latest edition of the World Bank's World Development
Indicators and is filled in using other data sources such as Oxford Economic Forecasting, Global Insight, Project Link, and the International Monetary Fund's International Financial Statistics. Conversion to dollars is based on a fixed 2005 exchange
rate. The population series is from the
Census
Bureau International Population Database. The historical exchange
rate series is taken from the ERS
Agricultural Exchange Rate Data Set. GDP shares are derived
by dividing individual country/region GDP by world GDP. Dividing
GDP by population yields per capita income. The GDP deflators and
consumer price indexes start with the World Bank World Development
Indicators and are supplemented with other data sources as with GDP. Further gaps in all of the data series are filled
in by a process of interpolation, extrapolation, or back
estimation.
Data Updates
The data are annual series with historical data from 1969-2008
and projections for 2009-20. Updates for the Baseline are done
once a year in December. The historical data are revised semi-annually
to reflect revisions as they become available.
For those who want the macroeconomic projections for the final
Baseline for any recent year or for more detailed data on the
countries in the regional aggregations, contact Mathew Shane directly
(mshane@ers.usda.gov,
202-694-5282).
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