This is lower than the peak seen in April to June 2021, but represents an increase of 10% compared with January to March 2020 (estimate taken as at April 2020).
Mae hyn yn is na’r uchafbwynt a welwyd yn Ebrill i Fehefin 2021, ond mae'n cynrychioli cynnydd o 10% o'i gymharu â Ionawr i Fawrth 2020 (amcangyfrifwyd ym mis Ebrill 2020).