Eurostat, Luxembourg. GERD by sector of performance and socioeconomic objectives (NABS 2007): Nomenclature for the analysis and comparison of scientific programmes and budgets (NABS 2007): Exploration and exploitation of the earth / Sector of performance: All sectors / Unit of measure: Purchasing power standard (PPS) per inhabitant at constant 2005 prices / Geopolitical entity (reporting): Bulgaria.