Very few of course. Other dog breeds are known to bite a lot in France. You can still own a pitbull but you require training and you need to muzzle them in public.

Still, there are approximately 35k pitbulls in France. Few compared to the total of course.

In France, German Shepherds cause 18% of dog bite attacks, 16% for Labradors. Generally bigger dogs -> more reported bite attacks, with some exceptions here and there where popular breeds end up higher.

Still, most studies don't find a direct connection between a dogs nature and their inclination to attack, or a weak one at best. There is of course a link between the breed and the severity of the attack however.