churn rate
measure of the number of individuals or items moving into or out of a collective over a specific period of time
en-US/t͡ʃɚn ˈɹeɪt/
en-GB/ˈt͡ʃɜːn ˈɹeɪt/
measure of the number of individuals or items moving into or out of a collective over a specific period of time