The SPEA website provides some of that information. In the application FAQs, it states "SPEA received over 500 applications for Fall 2014 admission. Our incoming Fall 2014 class is comprised of 185 students across our MPA, MSES, and dual MPA-MSES programs." And if you follow this link (http://www.indiana.edu/~spea/prospective_students/masters/prospective_students/student_body_profile/index.shtml), it gives student demographics including the number of MPA/MSES students.
I was accepted into the MPA/MSES program and am 95% sure I will be attending in the fall. I'm just waiting for funding information right now. I am a domestic applicant and recieved my accepting about 6 weeks after my application was completed.
Hope this info helps! And good luck!