MBTI in Software Engineering

Me (and a friend who also identifies as ISFJ) have been saying for a while that ISFJ, and SFJ / SF / F types in general are rare / underrepresented in our industry, but I realized while thinking about it today that while I've looked at some location-based statistics, I've never looked up MBTI representation within software engineering in general.  Well, there have been studies (however rigorous or non-rigorous) done on this, so we can put that question to rest.

This study from 2003 shows ISFJ as 2nd most underrepresented type (slightly behind ESFP) in engineering, with only a 2% representation, compared to 13.8% in the general population.

F types are also underrepresented (19% compared to 59% in general), and SF (12% compared to 43%) and FJ types (8% compared to 30%) are also underrepresented.  Another study which collates together a bunch of different results basically shows the same things.

These studies really aren't the greatest, but I guess now when I feel like I'm in a sea of T types in general, especially STJ and NTJ and NTP types, there's probably a good reason for it.