Those numbers appear to be 2015 statistics. They dropped even lower for many of those schools (Grinnell fell to 18%).
I just googled and noted whatever number came up first. OP at least has a better idea of admission rates at these colleges. I didn’t know all the data for 2016 were available. Where can I see the 2016 numbers? Even my kid’s college hasn’t puslished all the info yet.
Check if schools have posted their 2015-16 Common Data Set; it’s too early for 2016-17.