Ba minisitiri ba peteroli b’ibihugu 12 by’umuryango w’ibihugu bikize kuri peteroli, OPEP, bateraniye i Vienne muri Autriche. Bagomba kwiga niba bagabanya peteroli bacukura buri munsi kugirango bazamure ibiciro. Ariko abahanga babisesengurira hafi biteze ko OPEP ntacyo iri buhindure. Muri aya mezi 18 ashize, igiciro cya peteroli kituye hasi ho byibura 60%.