I personally don’t have the data available. But I did a quick search in the web and this is what I have found:
(Global Minecraft statistics)
And another one:
(bStats - Global Bukkit / Spigot stats)
(Changing Minecraft Versions – Hypixel Support)
So to sum it up,
1.12.2 is a great addition
1.8.8/1.8.9 seems also to be a thing, not a priority for us.
If we can pull reliable data for editions and versions from Overwolf that would be much better.
Cheers