Some codes have changed since WIMD 2019, such as the breakdown of residential burglary codes into crimes relating to burglary of the home and burglary of an unconnected building.
Mae rhai codau wedi newid ers MALlC 2019, megis rhannu codau bwrgleriaeth breswyl yn droseddau sy'n ymwneud â bwrgleriaeth mewn cartref a bwrgleriaeth mewn adeilad ar wahân.