Next time through I'll do a count and get the exact numbers, but I would say it was right around 50% pass through shots and the rest were buried to the fletching, most of the time leaving a monsterous exit wound.

Personally, I wasn't really suprised. It still takes quite a bit of energy to push that first inch and a half of "field tip" through the animal, followed by a lot of drag created by those huge blades.