I think CryptoQuant has the best free graph. 

Other graphs say similar things.

Not sure where the sub 2M btc on exchanges, I’ve seen it floating around my feed from time to time, from what I can tell the last time we had that was the end of December, 2017. 

Peaked ~3.4M in June of ‘22, and have been on a steady downtrend since that has rapidly increased pace since the start of the ‘24.

nostr:note1vk0qrdjlnpsl8m5f48qgqc38e3fnc2adhpg93stlghdhelqpvxwsga5af0
https://m.primal.net/Kbcv.jpg