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In page European Union:

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There is a significant variation in Nominal GDP per capita within individual EU states. The difference between the richest and poorest regions (281 NUTS-2 regions of the Nomenclature of Territorial Units for Statistics) ranged, in 2017, from 31% (Severozapaden, Bulgaria) of the EU28 average (€30,000) to 253% (Luxembourg), or from €4,600 to €92,600.[14]