I don't have any figures or data I can give you.
I can tell you that I was on one of the academy's selection committees this year, and we interviewed the 90 finalists in a pan-African competition for research funding.
A good chunk of the funding applications were submitted in French by Africans, whether in northern Africa, the Maghreb region or sub-Saharan Africa. I don't recall the exact number, but I would say a third or a quarter of the applications were written in French.
I think the success rate was comparable to that for English-language funding applications. The Académie africaine des sciences is a good example of development potential.