Sure, but the point of the rest of those words was to show that to get a 20 million surplus over 5 decades requires, at absolute maximum, .3% of the US to move

Sure, but the point of the rest of those words was to show that to get a 20 million surplus over 5 decades requires, at absolute maximum, .3% of the US to move to California per year in that time frame. (Or more accurately .3% more of the population moving to than moving away from California)