Ah, now I get it. Not a bad idea (and something I would like to see too) but goal of this topic is to compare local boards and not to compare how they perform against the forum in general. As I said before, I wanted to to keep this overview brief and its already kinda too big so I am not so inclined to add even more charts. But I will definitely think about it and maybe include it in one of the future overviews.
Thanks to a @ddmrddmr
intervention, I was able to produce something:

I find it quite interesting, even if the results are skewed by some heavy post deletion in Russian and Chinese sections.
Data is here.