That's what a sociologist/statistician friend of mine[0] told me. I don't have a citation to back it up, but I think he does. I'll ask him if he can provide it.

He lives in Belgium (I used to), and I don't know to which part of the world he was referring to (probably Belgium and/or surrounding countries).

--

0. http://progcours.ulg.ac.be/cocoon/en/enseignant/U191908.html