For new frosh, some examples:
Delaware 70% https://www.udel.edu/admissions/for/freshmen.html
Alabama 60% http://www.al.com/news/tuscaloosa/index.ssf/2014/07/is_the_university_of_alabama_s.html
Ole Miss 57% (see above)
Michigan 43% http://www.annarbor.com/news/university-of-michigan-sees-increase-in-out-of-state-students/