I can't speak for other schools, but at (D3) Haverford, my guess is 2/3rds take a semester abroad.
Obviously the baseball team, who make up about 6-7% of the school's enrollment, are limited to fall semesters only.
While HaverSon was playing, we hosted at least eight baseball players who were taking long weekends in Paris, plus another 8-10 Haverford students also taking international semesters.