How many winter/snow maps where in Summoner's Rift in EuWest up until now?

So i recall never playing in a winter summoners rift before(snowy map skin), but a friend of mine says he did, many times, which i call it bs. But i just want to be sure, so i need your help, or is there a way to be sure on **how many times were winter/snow maps in summoners rift used throughout the years.**(more specifically in EuWest) Thank you, any input would be really appreciated. Cheers
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