Mae'r Hawl i Brynu wedi bod yn rhan annatod o gyfundrefn tai cymdeithasol ers nifer o flynyddoedd yng Nghymru, ac mae wedi arwain at golli nifer sylweddol o dai cymdeithasol - fwy na 139,000 rhwng 1981 a 2016.
The Right to Buy has been a feature of social housing for many years in Wales and has resulted in the loss of a significant number of homes – more than 139,000 between 1981 and 2016.