http://www.opserver.de/ubb7/ubbthreads.php?ubb=showflat&Number=349759#Post349759i just copied the link from this other thread.
of course this doesn't directly correlate to the user numbers but it isn't totally uninteresting either.
maybe you are right about the others but "unity" without "3d" is useless. it's just an english word unrelated to game engines and there is no change in the graph even before unity did exist.
