They waitlist just about everyone they interview, unless you do something absolutely atrocious. I think there were 30 people per interview with maybe around 10 interview periods, so that's about 300 people interviewed (very rough estimate, maybe more, maybe less). AAVMC says they have 130 seats for each class, so that's potentially 170 waitlist spots (those who interviewed but weren't initially admitted). However, this year they randomly decided to admit some people without interviewing with no warning whatsoever, I'm going to guess around 30 people (but I have no idea), so that's fewer people who were accepted after interview. With that, I would say there are at least 200 people on the waitlist.