Before the xpac hits, what are the most and least played classes ( lets say that people MAIN)

I guess its easy to group all the tanks and healer classes and say its those 5-6 but in general, for each role, what are the least and most played classes??

Back when ARR was couple patches old, felt like I saw a TON of DRG and BRDs, not sure if thats still the case. I felt the WAR/PLD were balanced in terms of popularity and I felt the healer classes were balanced as well with maybe seeing sightly more SCH than WHM