99%
32% of the residents of Belgium speak French. Since the country's population is around 10,258,762, that would mean that about 3, 282, 803 speak French in Belgium.
0.078% of French population speak basque. Anyway, Basque in France is only spoken in the french Basque Country (Iparralde). In this area 22.5% of the people speak fluently basque and there's another 8.6% who understand it but can't speak it.
French is the language of French people, who are the ones living in France.
People of France speak French
"la République Française", short form: la France
78.6% of the people in French Guiana speak French...
People from France speak French
Less than 2% of citizens of France don't speak French.
The people of France were the first to speak French.
Practically the whole population of France speaks French. The French are not keen on 'multi-culturalism' and regard it as a shade subversive. If one lives permanently in France one is expected to speak French. In some parts of France other languages are spoken in addition to French, for example in the extreme south-west, Basque, and in Alsace a dialect of German.
People do not speak French in Argentina, except a very small population of immigrants from France and French speaking countries.
The people of France speak French.