Most of the data updates we could make would relate to the year 2019 or before and therefore to a period prior to the coronavirus (COVID-19) pandemic.
Byddai'r mwyafrif o ddiweddariadau data y gallwn eu cyflawni yn ymwneud â'r flwyddyn 2019 neu cyn, ac felly â chyfnod cyn y pandemig coronafeirws (COVID-19).