Tier 1 - Applications completed between July 1 and August 1
Tier 2 - Applications completed between August 2 and September 1
Tier 3 - Applications completed September 2 through November 1
UOP is rolling admissions.
I wouldn't worry about the statistics. Just know that the earlier you apply, the better the chance you have of getting an interview and hopefully, an acceptance. Tier three people get in, too. UOP received my full application (PharmCas and supplemental) beginning of tier three (beginning of September) and I interviewed in January and received an acceptance three weeks later. Good luck to you!