I don't think many '19s were produced because so many '18s are still out there. Why would a dealer order a newer model when the old one's still haven't sold? I've been looking and haven't been able to find any numbers on how many '19s were produced. As for now, production started for the '20s at the end of July. The dealer by me has a couple of '20s coming in next month. Also, I think the '20 is going to be a short model year since the new platform is supposed to be revealed in Jan. with production starting a couple of months after that.
I've looked on autotrader, carguru, and cars.com and '19s seem to be unicorns. There is a used one with 38k at another dealer local to me.