As for native Californian's you'd be surprised. There are 38 million people there and my guess is at least 2/3 of them are from there. I used to live there and still go there for work/pleasure 8-10 times a year and I encounter as many people from there as any place I've ever been. The thing is, in my experience native Californian's rarely move to other states. I don't know the hard statistics but I bet California is in the top 5 states in retaining residency of people that are born there.