* No official census specifically asks about first language. Data on language is often collected as part of broader surveys.
* The concept of "first language" can be complex. For example, someone may have grown up speaking French and another language at home, making it hard to definitively say which is their "first."
* Immigration patterns and language use can change. The number of speakers of languages other than French in France has been growing in recent decades.
However, we can make some educated estimates:
* The vast majority of the French population speaks French. This is due to France's long history as a nation with a dominant language.
* Estimates suggest that around 90% of the population speaks French as their native language. This is based on various surveys and studies.
Therefore, while we don't have a precise figure, it's safe to say that a very high percentage of people in France speak French as their first language.