Surprised to see Clojure going down. I only heard about it last year for the first time and it seems to be popping up more and more.
Wow, I would not have thought that Python would be #1 like that.
It's a good language for interviews - there's a lot less boilerplate than most alternatives (conversely, IMO dynamic languages like Python are unsuitable for projects larger than a certain size). So I'd expect these numbers to skew in Python's favour.