The admission exam to the UNAM is quite competitive and only a small percentage of those who apply get in. This chart compares the number of students that applied to study at the UNAM with those that were granted admission. The data corresponds to all who applied to take the test from June 2011 to June 2013.
On the left are all the students who applied to the UNAM, by major. On the right all those who gained admittance (June 2011 - June 2013)