I dont think it works like that. It depends on what rank your nation is. For example, I was in Dark today with 18332 score and I made 370 supply tokens. If it were to be a fixed ratio, it would mean I got 1 token per 49.5 points (approx). However, someone who got a lower ranking nation would get less than what I did. Personally, I dont think its a fixed ratio as Ive seen people who got a lot more tokens while only have a bit more score.