This spreadsheet, from Connecticut's State Department of Education, details the number of students participating in Connecticut's Open Choice program — by resident town — each year from the 2013-14 school year to the 2017-18 school year.
Open Choice is a program in which Connecticut students can attend schools in local public school districts outside the community in which they reside. Connecticut’s statutes currently allow for districts in the Hartford, Bridgeport, New Haven, and New London areas to send and receive students from participating districts in their respective region.
Citation
Connecticut State Department of Education. (2018). Open Choice Enrollment, 2013-2018. Hartford, CT: Author. Retrieved from https://schoolstatefinance.org/resource-assets/Open-Choice-Enrollment-2013-2018.xlsx.