There was a period of a few weeks where there was little over 1M in the lending book and rates were very high. 1.4% was the highest I saw. It ended with the start of this bull run though and a flood of cash into lending again. My last one of 0.7% just closed.
Just check back when there has been a bear market for a few weeks. If we've lost more than 50% of the btc value then you can be sure a lot will have left the lending book. Then when it starts to recover traders will short the gains, demand will exceed supply in the loan market and rates will jump again.
I wouldn't expect that to happen for a while now tbh. Not with Maid anyway. And it never lasts for long either. Nice when you get it though.