Login to MSAR, pick a school, and go to the "Acceptance Information" tab on the bottom left. It will tell you how many in-state and out-of-state applications were received by the school, how many were interviewed, and how many matriculated (unfortunately they do not say how many were accepted, although I'm sure a lot of schools' websites will have this info). If I remember correctly, the number interviewed does not take into account people who were offered interviews but then cancelled their interview or withdrew after receiving acceptances elsewhere, so the number of interview INVITATIONS is likely higher.
(Someone please let me know if my last point is wrong btw).