To be brutally honest I don’t think Historical average in Coastal SD is going to be that meaningful, same for a lot of the LA and OC,
The region has grown tremendously over the last 30 years and has become a lot more international so what the average was for Coastal SoCal 20 years ago (or even 10 years ago) may not be that meaningful now.
Some will argue but I maintain that although the growth has slowed in the last 5 or so years, it will only grow faster in the future.