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The calculation of unit value indices is done based on the data from Custom Declarations, separately for each commodity (8 digits level), group of commodities (6, 4, 2 digits level), and total exports (imports), according the Nomenclature of Goods. Selected commodities (representative goods) for the calculations include homogenous goods with information available on quantity and cost and that are present both in reporting period and in base period. For the aggregation of unit value indices, calculated at 8 digits on different levels of the Nomenclature of Goods and by total of exports (imports), the value of goods in current period is used as the weighting element.
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