As per DdmrDdmr suggestion, here is the overview of the active members per local board, separated in groups by their activity (1-9 posts, 10-99 posts and 100+ posts). Initially I created 5 separate groups (two additional ones were 10-49 and 500+) but it was a total mess and you couldn't really see much. After spending few hours this is the best I could come up with, while keeping it somewhat visually pleasing and in line with rest of the charts.

It would have been much easier if it was only few local boards with not so big difference in terms of numbers, as having 18 boards with a huge difference really makes it harder to create something like this.

---

@fillippone looking forward seeing your implementation for Italian board.