Perhaps simply working by language rather than by country would have been a better option. I know what you mean about trying to work out the "nationality" of a film - it's a problem we have here in New Zealand a lot, being a small country with a prominent but US-funded film industry. Mind you, even splitting by language would be a problem (one of my all-time favourite films is Wings of Desire, which has sections in French, German and English). ...wha?