Let me answer you very quickly. As I mentioned earlier, it's quite clear that if we simply place emphasis on mother tongue, there is of course a reduction. That's normal since there is a high rise in non-francophone and non-anglophone immigration. However, in Montreal, if you examine the use of French at work, you then have a completely different picture because you're talking about a situation of language in the public sphere, which as I said is governed by different mechanisms. Over 270,000 francophones in the suburbs come to the Island of Montreal to work every morning. That changes the picture of the situation on the Island of Montreal. It's very different from Montreal at night. It's also very different if you take into account only the language spoken at home or the mother tongue.
I agree that there is a significant difference between language characteristics and language behaviour.