This makes no sense. The deadline for deposits is May 1. Most people haven’t even made their deposits; how could anyone know what the percentage would be?
According to the 2016 outcome report you mentioned, UChicago got 4 offers from Yale law school. That year, Yale law school made 259 offers. That’s 1.5% of the total offers, way less than 10%. I highly doubt it would change that much for class of 2017.