The DOE website presents the data in a couple of ways. One is actual numbers which will match the Clery report. The other is to normalize by dividing by the total number of enrolled students on campus, a number also provided. For the University of Chicago that was approximately 17,000 students in 2018. Penn and Columbia are larger. When you select the university, you can actually choose which campus you want to include. Some universities will have campuses in several locations. I stuck to the data relating to the main campus for all the universities presented above.