Exchanges accounted for 17% of all lettings for 5 local authorities (Bridgend, Vale of Glamorgan, Cardiff, Merthyr Tydfil and Monmouthshire).
Pryniannau prynu-i-osod oedd 17% o’r holl drafodiadau preswyl a wnaed ym Merthyr Tydfil, y ganran uchaf o blith yr holl awdurdodau lleol.