Is it normal for UIUC to defer a lot of engineering and business applicants?

Supposedly, the number of in-state applicants who were deferred was lower this year: http://www.news-gazette.com/news/local/2016-12-16/first-wave-ui-applicants-will-learn-their-fate-4-pm.html

Engineering and Business are very competitive to start. Consider that some engineering majors, like Bio and CS are also very oversubscribed and are essentially as tough as a top tier ivy league or other elite school for acceptance.