I'm hoping they will update their website. I also see they've included the 2019 freshmen class, but not their ratings.
However, if just looking at recruiting classes, it's not tedious when you already have the data in a spreadsheet!
For the last ten years, Illinois has had 9 recruits at or above 0.890 (which seems to be the 4* barrier) out of 247 recruits, which comes out to 3.6%. (This doesn't include transfers in or out, for all data in this post.)
I don't trust the 2004 numbers on 247's site, but 2005-2007, Illinois had 10 out of 61 recruits rated at or above 0.890 (16.4%).
The last two years has been 5 out of 42, or 11.9%.