Altogether in the top 25, the average international attrition from 2017 to 2020 was about 6.4 percentage points across 21 schools, including 20% or more at 10 schools. For the top 10 schools, the losses were steeper: 17.2% at nine schools. Worst-hit among the latter elite institutions: Donald Trump's alma mater Wharton, which lost 44% of its foreign MBA students, going from 32.4% in 2017 to just 19% this fall.