Others would have already found this but not given a link. Here's upland harvest data for 2014 and a link to info back into the 1940s so you can see how good it used to be and how many hunters there were. Something to do when you're not hunting.
https://nrm.dfg.ca.gov/FileHandler.ashx?DocumentID=108608&inline
https://www.wildlife.ca.gov/Hunting/Upland-Game-Birds#22503332-harvest-data
https://nrm.dfg.ca.gov/FileHandler.ashx?DocumentID=108608&inline
https://www.wildlife.ca.gov/Hunting/Upland-Game-Birds#22503332-harvest-data