Data relates to the period immediately after the EU Exit; however, the impact of EU Exit may have affected responses and the robustness of the data collected during this period.
Mae’r data’n ymwneud â’r cyfnod yn union wedi ymadael â’r UE, serch hynny, gallai effaith y cynllun ymadael yr UE wedi effeithio ar ymatebion a chadernid y data a gasglwyd yn ystod y cyfnod hwn.