This was a question I raised a while back. Not fond of being DC'd to no end! With slim to none escape!

What was the number of DC' s carried by individual war ships and also DD attack groups? Also was the amount carried less in the beginning of the war than in latter part of war time?
I was thinking that the # of DC would be lower then increasing as more shipping was being lost over the course of the war.
So if this is true to historically correct numbers, is this something that can be modded as well?
Fith