Take a look at my class for instance. It's a humanities class.
There are 20 people in my class.
10 are ISTp's. 2 are ENFp's. 1 Estj. 1 ESFp and 1 INTp. 1 lonely ISFp. 1 ESFj and 1 INTj. 2 unidentified types, 1 of which probably belongs to delta.
That's 13 from delta, 2 from alpha, and 3 from gamma. The other two fit very well into delta but we'll just let them orbit around for awhile first.
Man just look at the statistics alone (and based on fallacious thinking) delta will take over the world!