It is shown. If you scroll down in your profile, theres a section called "9 Player Roles". There you can arrange it after Assits. I can tell you as a medic you´ve got 2578 assits.

Nice, never noticed that
And I just realized I have 998 assists as heavy
(296 as medic)
And since I don't have Kollectivization achievement yet, I can say I have been here for quite a measurable amount of time.
Also, Knife image in PS (
http://psychostats.specialattack.net/im ... /kinfe.png) doesn't exist. Gotta fix that.