Good question. There isn't a unanimous way of doing it. Either method is OK with me as long as you're consistent, but if you put the ranks added at that level, be sure to tell me what the total is afterward. Don't just say "Intimidate +2." Say "Intimidate +2 (12)" or something. So, I'd be equally happy with:

Level 9: Intimidate 9, Bluff 12
Level 10: Intimidate 10
Level 11: Intimidate 12, Bluff 13

OR

Level 9: Intimidate +1 (9), Bluff +1 (12)
Level 10: Intimidate +1 (10)
Level 11: Intimidate +2 (12), Bluff +1 (13)

Either of those will make me perfectly happy. If you can find another method that's equally readable, go for it. Readability and consistency are what I'm after.