Hello Raj, yes, there are lots of data available to back up this claim, and from multiple cities. San Francisco, New York, Los Angeles, Portland, Santa Monica, Venice Beach, as well as cities abroad (Barcelona, Paris, London, etc). I include a lot of this data in Chapter 2 of my new book (published today, October 20) Raw Deal: How the Uber Economy and Runaway Capitalism Are Screwing American Workers. Check it out, I think you will find that the information is eye-opening. I know it was for me, when I conducted the research for my book.