Sorry, I didn't see your question until now. Unless I'm mistaken, they had a list of their sources somewhere on their website that I saw a few years ago. I don'

Sorry, I didn't see your question until now. Unless I'm mistaken, they had a list of their sources somewhere on their website that I saw a few years ago. I don't think they said where their minute-by-minute came from, but I'm quite sure they calculated that data themselves.