Short term, quarterly changes can be volatile, although are presented here given the significance of the decreases seen across the UK in April to June 2020 compared with the start of the year.
Gall newidiadau tymor byr fod yn gyfnewidiol, cyflwynir y data dros dro yma o ystyried y diddordeb yn effeithiau Ymadael yr UE ar fasnach ers mis Ionawr 2021.