UNC-CH admits OOS applicants in numbers that are calculated not to exceed 18% of an entering freshman class. See “Undergraduate Admissions” on Page 2, here: http://www.admissions.unc.edu/files/2013/09/Admissions__Policy.pdf. The numbers of OOS applicants far outweigh the number of places that are available with the 18% cap; that is why you have low acceptance rates. Thus, the entering Class of 2021 at UNC-CH had a 14% acceptance rate for OOS applicants: http://admissions.unc.edu/apply/class-profile-2/.