<p>Looking at the stats, there are 9558 total admits (46030 - 36472), 8381 Fall 2012 admits. This means 1177 Spring 2013 or appeal admits. On the official acceptance date, they said there were 1000 Spring 2013 admits, this means 177 successful appeals with 1000 total appeals.</p>
<p>Thus, the appeal success rate is 17.7% for this year.</p>
<p>I may be wrong, just guessing from the numbers.</p>