White Labs lists is on their website as 73-80% so say 75% and you should be fine. I usually just put 75% when I calculate on tastybrew.
Primary - Empty
Secondary - Empty
Bottle Conditioning - None
Drinking - Peanut Butter Oatmeal Stout, Barleywine, Saison, APA, Strawberry mead
In the Works - Summer Rye for my wedding, May 15, 2010