Not much about this is available online. We do not have any eye color experts. After a brief search using www.google.com, a site was found that lists a distribution of eye color in an American experiment. With a sample of 324, the results were:
32% blue/grey irises
15% blue/grey/green irises with brown/yellow specks
12% green/light brown irises with minimal specks
16% brown irises with specks
25% dark brown irises
You may be able to find more if you search on: "eye color" distribution France (for example).