Premiums are now being paid on over 15,800 of the 24,900 second homes liable for council tax in Wales and on 7,300 of the 25,700 long-term empty properties.
Mae premiymau bellach yn cael eu talu ar fwy na 15,800 o'r 24,900 o ail gartrefi y mae'n rhaid talu'r dreth gyngor arnynt yng Nghymru ac ar 7,300 o'r 25,700 o eiddo gwag hirdymor.