However if you find OCaml in the tiny graph on the bottom you'll see that it's steadily increasing at least. Up about 50% in active repos from 2013 to 2014.
Err... based on what exactly? I've been working in the OCaml community for several years now and it's going from strength to strength. Do we have different definitions of 'strength' or something?
Also, another thing that's peculiar with OCaml is that a lot of libraries are LGPL 3+ which makes it that much harder for corporates to adopt. And sometimes, alternatives to certain libraries are either hard to find, or are not actively maintained. It could also be that, I have been looking in all the wrong places.