katie
This year there are 5 rounds of offers. The first two were in September, but the third round is Wednesday, October 19th. I'm not sure when the 4th or 5th round would be though.
It really depends on which school you go to, if your school has a lot of competition and less spots, then your chances would be lower than if there were less competition and more spots available. I definitely think you have a pretty high chance of getting in if the 4% mark hasn't been reached.
Good luck!