Doesn't include another large group - repatriating Europeans. Our friends went back to Germany last year after 20 years in USA (permanent residents, didn't nat

Doesn't include another large group - repatriating Europeans. Our friends went back to Germany last year after 20 years in USA (permanent residents, didn't naturalize). My family plans similar move as well in a few years, mostly blocked by my postgraduate program and exact location to return to. There are other scenarios where we'd move right away, like if my spouse gets laid off.