The most waiting more than one year was in Cwm Taf Morgannwg (5,535) and the most waiting more than two years was in Swansea Bay (1,292).
Er mwyn cael trawsblaniad aren gan rywun sydd wedi marw, mae'n rhaid aros tua 2 flynedd ar gyfartaledd, ac mewn rhai achosion prin gall fod dros 5 mlynedd.