The number of children adopted had been decreasing in recent years from a high of 385 children adopted during 2014-15.
Rhwng 1981 a 2014, cafodd 138,709 o dai cyngor eu gwerthu – mae hyn yn cyfateb i leihad o 45% o ran y tai cymdeithasol sydd ar gael ers i'r polisi gael ei gyflwyno am y tro cyntaf.