I'll give you with some 10-year data from 2009 to 2018, on average, for all NSERC programs. In fact, if we dig deeper, we see that the data varies by program.
If we group all programs together, we see an average French success rate of 73%, compared to the average success rate of 66% for all NSERC applications.
Some programs will sometimes show opposite trends. However, we are close to an equivalent success rate. It's slightly higher for applications submitted to NSERC in French.