For historical waitlist data for the past 10 years, check the common data sets at
https://apps.carleton.edu/campus/ira/CDS1/ . Sections C1 and C2 provide data on # applications, # admitted, # yield, # on waitlist, # admitted off waitlist. For entering fall 2007 class:
4840 applicants, 1444 admitted, 509 yield
1368 offered place on waitlist, 306 accepted place on wl, 5 admitted from wl