The image beneath the spoiler tag has the clear rates of Savage across all servers (based off of data obtained from the Lodestone - NOTE: LuckyBancho collects this data based off of the Omega mount ownership, so there may be slight variance in the number of clears).
The main column you want to look at is the far right, which shows the percentage of clears per the active server population for each world. The second-to-the-right column (オメガアルファ) are the numbers for the amount of players on each server that have cleared Alphascape and have the mount.
There are other columns that show the number of Level 70 players, how many have cleared up to Patch 4.1, and the clears for Deltascape (4th from the right) and Sigmascape (3rd from the right).
Hopefully this is not a crappy explanation - posting from phone, which makes it difficult to actually cross-reference the chart without switching tabs every time I want to make a reference.
