This report from UIC is about what I’d expected - about 52% of UIC had pell grants:
http://www.trustees.uillinois.edu/trustees/agenda/January-19-2017/r-UIC-Dashboard.pdf
UIUC Reported it’s own: 20%
http://www.trustees.uillinois.edu/trustees/agenda/January-19-2017/r-UIUC-Dashboard.pdf
Looks like USNews doesn’t do very good reporting.