Since September the number of items issued has fluctuated between 13 and 14 million but has decreased to 11 million in the latest week.
Ers hynny, mae nifer yr eitemau a ddarparwyd wedi amrywio, ond gan aros oddeutu 13 i 14 miliwn, ond mae wedi gostwng i 11 miliwn yn yr wythnos ddiwethaf.