Poker Grader

Does anyone have a good estimate of what the general "Potential BB/100" is for all:

2/4 games
3/6 games
5/10 games
...as far as you care to go

(Let's assume Party if that's necessary)

This is hardly comprehensive, but as a starting point:

4600 hands of 2/4 - Potential of 7.18BB/100

I'm not sure if this stat is pre-rake or post-rake...