French is the language of the Luxembourgish legal system and government so apart from recent immigrants, all Luxembourgers can speak French if required, but this does not mean that they speak it at home. Most Luxembourgers speak Letzebuergesch at home with some speaking German, Portugese or Italian as their first language.
twenty percentage of people in marseille speak french
78.6% of the people in French Guiana speak French...
About 20% speak French as their native language.
80% of Gabonese people are French speakers, but a far smaller percentage are native French speakers. Most people in Gabon speak French as a second language.
Nearly all Luxembourgers are fluent in Luxembourgish, French, and German, so close to 100%. This is because all three languages are taught in school.
As of 2013, less than 1% of the population in Niger speak French.
The native language of Monaco is French and nearly all inhabitants speak it.
Some Chinese people certainly speak French, but this would be a small minority (by percentage).