Penn wasn't on VSAS last year; might be the same this year. I was able to snag an away late in sub-I season (applied in Sep for rotation during late Oct - Nov), probably due in part to Penn's lack of VSAS visibility, as well as the large amount of Penn-specific paperwork required by the application. I think that these factors combined to reduce the number of students who applied for the EM sub-i, but that's really just a guess -- I have no idea how many tried to rotate there.