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With the 2014 edition, a number of improvement has been made such as the inclusion of new data and information and simplification of some table¬žs lay out found in the previous publications. However, to maintain time series comparability, most of these table¬žs format were retained and updated with more recent data. Where the current data are not yet available from the usual sources, BPS substitutes them with estimated data derived from related documents or from its own time series data.