Me? No. I'm a data analyst, but I don't work for Amazon.
But I imagine that information is done with database querying, then the whole mess is brought down and most likely put into Excel or even Powerpoint for presentations.
A database such as Amazon has got is going to be huge. It's collecting point of sale data and not just from them but from other sellers, online, bookstores, etc. Then it's comparing it to all other books for sale. Then it's comparing to previous weeks in order to get a trend line.