And also with closed-minded sorority members, who had their pledge classes picked out months ahead of time! But it got so bad that the year I was a junior, recruitment was moved to second semester of the freshman year and then the next year to first semester of the freshman year.
I don't think we had release figures back in the day. With only a 3-day rush, it was worse because legacies or people with recs couldn't be released by any sorority until the day after the second (theme) parties so there they were, thinking they were having a great rush, and BAM!!! Few or no prefs to go to.