Having spent a lot of time going through the enneagram forum here, 9s seem to be talked about a lot. I do believe 6s are undertyped. 5s are talked about surprisingly little. There are two options if we want real data. First, we could look at our own stats. The second thing we could do is reach out to someone who does this professionally and see if they have data they would be willing to contribute.
My experience is that 1s are undertyped while 6s are overtyped. What the?
"I absorb energy like a sponge everywhere I go. It allows me to see the world and my purpose in it." Zak Bagans, Ghost Adventures (INFJ)