Substantial? I doubt it. While Apple does a lot of retail volume, the big money-makers like the iPhone can be drop-shipped from anywhere in the EU. There are 20 Apple stores in France, but millions of iPhones there; I doubt more than 20% of French iPhone users purchased at an Apple store, and probably closer to 5%.
It must be, otherwise why would Apple even have a retail channel in France? I think the number would be closer to 50%. Keep in mind that iphones are purchased at all sorts of retailers apart from istores.
