Yet another way of measuring (also without providing any type of source, searching "JVM Language Report" brings up a dozen of different results, whereas the first one lists Clojure as being 3% and Scala as 2.36%, can you just link the source instead of asking people to do your sourcing for you?) that is also not perfect.

In the end, we will never know the "real" numbers, and developers like me who use Clojure and find themselves most productive in it, could not care less either.