Galician canning factories usually use sunflower oil produced
in Spain. The Spanish sunflower oil production system
comprises three main sub-systems: (i) cultivation of sunflower
seeds, (ii) production of crude sunflower oil, and (iii)
refining. Primary activity data for the first two stages were
provided by an international company located in southern
Spain, while data related to the latter came from another
company, also in southern Spain, that refines more than
35,000 tonnes per year.