I'm just shy of 20k in subscriber, but my CPM is $1.45/1000. I probably would be able to earn far more than that if it weren't for the numerous Content ID claims on my videos that I cannot challenge.
It all depends on several factors - which of your videos are monetized, how long are those videos, how long have they been monetized, how long did the viewer watch the video, how many viewers watched the ad without closing/ad-block, etc.