% weight loss in a year?

well, you'd have to define "generally" but statistically speaking lightweights are much more lightly to get to 100% excess weight loss than people who start out SMO. Basically the lighter you are when you get WLS and the shorter your time MO, the better off you tend to do. Your body has less damage that has to be repaired, is the theory so the surgery can do a better job repairing it.