TL;DR: It's Portugal!
International demand for wine has been outstripping supply for years, and if you want to point the finger of blame at any of our European neighbours, here's a handy guide to who drinks the most.
Who would have thought that Swedes would drink more wine than us Brits? Hic.
A note on methodology: The map's creator extrapolated wine consumption per capita from World Health Organisation data on total alcohol consumption.