Hard to predict if they will use the wait list this year, they only used it in 3 of the last 7 years.
Link to Common Data Sets:
http://registrar1.princeton.edu/data/data.cfm
2007
Number of qualified Applicants Placed on Wait List...........792
Number Accepting a Place on the Wait List....................483
Number of wait-listed Students Admitted.......................47
Total Class Size.............................................. .......1244
3.8 % of Class came from the wait list
2006
Number of qualified Applicants Placed on Wait List...........1216
Number Accepting a Place on the Wait List....................789
Number of wait-listed Students Admitted.......................0
Total Class Size.............................................. .......1228
0 % of Class came from the wait list
2005
Number of qualified Applicants Placed on Wait List...........1207
Number Accepting a Place on the Wait List....................794
Number of wait-listed Students Admitted.......................0
Total Class Size.............................................. .......1229
0 % of Class came from the wait list
2004
Number of qualified Applicants Placed on Wait List...........1045
Number Accepting a Place on the Wait List....................719
Number of wait-listed Students Admitted.......................79
Total Class Size.............................................. .......1172
6.7 % of Class came from the wait list
2003
Number of qualified Applicants Placed on Wait List..........471
Number Accepting a Place on the Wait List....................298
Number of wait-listed Students Admitted.......................27
Total Class Size.............................................. .......1176
2.3 % of Class came from the wait list
2002
Number of qualified Applicants Placed on Wait List...........NA
Number Accepting a Place on the Wait List....................NA
Number of wait-listed Students Admitted.......................0
Total Class Size.............................................. .......1164
0 % of Class came from the wait list
2001
Number of qualified Applicants Placed on Wait List............NA
Number Accepting a Place on the Wait List.....................0
Number of wait-listed Students Admitted.........................0
Total Class Size.............................................. .........1185
0 % of Class comes from the wait list