Acceptances?

Admittedly,we made our list of colleges nearly a year ago, but the college stats on College Board have changed drastically since then…for example, when we first started looking, MoHo acceptance rate was 47% and has dropped to 55%, Clark University was 62% but has risen to 54%, Ithaca College rose from 67% to 59%…those are just examples. Does this happen every year?