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IIRC, a new group can invite back whomever they wish. They're considered to have had a 0% retention rate, so the cap is infinity (or, more practically speaking, the number of PNM's participating in recruitment).
If the group has participated in recruitment for one or two years, the 0% is averaged in for the other year(s). So if a sorority participated last year for the first time, and their retention rate was 90%, they would use (0 + 0 + 0.9) / 3 = 0.3 = 30% to calculate their cap.
Obviously, a sorority can choose to invite back fewer people than it's entitled to invite.
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