From last spring's Scholastic: "Currently 63 percent of seniors live off campus, and only 28.5 percent of senior non-RAs live on campus." That was up from November 2003, according to "Scott Kachmarik, associate director of residence life, [who] said about 52 percent of current Notre Dame seniors live off campus. (http://ndsmcobserver.com/2003/11/nd-students-move-off-campus/). That said, the junior class number has never been as high as you suggest, though it certainly has increased. Keep in mind, perception gets skewed because of so many juniors that go abroad.