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I'm going off an estimate looking at the Model3Tracker...
There have been 2,289 US reservations logged. Of those 579 are in CA. that is 25.29% of US reservations on Model3Tracker going to CA.
I had actually read @badbot's comment wrong, and had thought he was saying ½ of all US were CA. So really the correct response to him should have been ⅛ of all are CA.