Where can I find how many Ranked games were going on a day in each elo starting at season 4

Somebody said on the forums that half as many Ranked games are going on a day on SR now in season 9 compared to season 4, where can I find this kind of information. And, don't tell me the information doesn't exist and not to believe the information you get on the forums. If you have the information just post it please.
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