@ATXMom: Here is a link from last Spring, giving waitlist info: https://www.washingtonpost.com/apps/g/page/local/college-wait-lists-many-in-limbo/2018/?tid=ainl . Go to the interactive wait list link about 2/3 of the way in; for UNC-CH, in 2014 there were 31 admits off the waitlist; in 2015 there were 78 admits off the waitlist. In both years about 3150 people were offered waitlist status; about half of that number accepted waitlist status. For the 2016-17 academic year, 3986 students were waitlisted; 2024 accepted waitlist status; and 86 were admitted off the waitlist.
The information also is found at Section C2 of the Common Data Set for UNC-CH.