IPEDs is reporting for the current juniors in college, so lags current admissions trends by several years. Families can search for press releases from the spring to see the most recent data, before Common Data Sets etc. are updated. Some schools are changing fairly quickly so data from even three years ago may not accurately represent the current environment.
For instance, Denison’s acceptance rate has been dropping, from 44% for 'class of 20 (most recent reported in IPEDs), to about 38% for class of '21 and '34% for class of '22. Applications have increased to over 8000 this year, from as best I recall, around 6000 several years ago. Kenyon’s has done the reverse, with I think about 26% for class of '20, 28-30% for class of '21 and 34% for class of '22. Another example would be Grinnell, which both my kids looked at – for my older son’s admissions process (college class of '16), Grinnell may have been close to 50% when we started researching, was in the low 40%s by the time he applied, and by the time his younger sibling was looking for class of '20, it was 20%.