@Meddler, What are the stats on which keystone masteries people are taking?

I am having trouble finding the data online, and I was curious as to what keystone masteries people are choosing for their games. In my games it feels like Thunderlord's is the default option, but I was wondering if that trend was playing out beyond just my small sample size.

If you could post or at least discuss the data, that would be greatly appreciated.

Thank you, Sir Choingler