This is from a CC post in April:
“For the 2016 applicants (Fall 2017 TOs), approximately 500 were offered TO in CALS (includes Dyson). Typically 50% of so take Cornell up on the TO offer & apply. Last year, out of 500, 280 students utilized their TO & were admitted. Of those, 180 (64%) ended up coming to Cornell as sophomores.”
http://talk.qa.collegeconfidential.com/cornell-university/2068567-transfer-option-class-of-2022-at-cornell-p2.html