In each year, around 60% to 80% of the tax due has been contributed by transactions with a non-rental value greater than £1 million.
Ym mhob blwyddyn, mae tua 60% i 80% y dreth sy’n ddyledus wedi'i chyfrannu gan drafodiadau sydd â gwerth nad yw'n werth rhent o fwy na £1 miliwn.