X Census (for 1.9)
Topic’s name is a funny (and friendly) devotion to GNOME Census. So let’s take a look at some numbers from the time Xorg 1.9 was in development - raw data is here.
Would be unfair to measure only the work that happened e.g. in X server or in the drivers being developed and come up with the statistics about “who developed X”. X and X development community are quite extensive and don’t concern only “graphics” related, i.e., pixel information that appears on your display screen. This is a very common mistake.