Does anyone have stats on what percentage of newcomers to SF actually work in tech? I'd be very curious: is it the vast majority, or are tons of other people co

Does anyone have stats on what percentage of newcomers to SF actually work in tech? I'd be very curious: is it the vast majority, or are tons of other people coming here too because the local economy's doing well in general, or because SF just is a culturally trendier place to live than it used to be?