Hmm, you'd probably have to have access to something like DndBeyond's data to compile such a chart (or use one they compiled). Problem is, there doesn't seem to be anything like that. The only published data visualisations are about races, classes and names.
So I don't think you can just search for it, the only other option I see is gathering that data (if from a smaller sample) yourself, by creating a poll asking for their ability spreads if they used point buy. You could try and advertise it in appropriate communities, and once you feel like your sample size is big enough, you can calculate the percentages.
I wish there was an easier way (and maybe there is and I just didn't look far enough), but from my chair, that's the only option.