I have the top five as: ; (12 times) I (11 times) * (10 times) - (10 times) 2 (10 times) and for the quick-brown-fox sample he posted in the comments, I have:

I have the top five as: ; (12 times) I (11 times) * (10 times) - (10 times) 2 (10 times) and for the quick-brown-fox sample he posted in the comments, I have: ! (14 times) # (13 times) C (11 times) , (11 times) U (10 times) So I'm not convinced this is a fruitful path of inquiry.