
Keywords: بازده ثابت نسبت به مقیاس; CRS; Constant returns to scale; DEA; Data envelopment analysis; DMU; Decision making unit; EC; European Commission; EFFCH; Efficiency change; EU; European Union; GDP; Gross domestic product; GW; Gigawatt; KWh; Kilowatt hours; MI; Malmquist index; GWh; gig