However, not all of these were recorded on data collection forms, so the statistics presented in this release will show an undercount of the actual activity which took place.
Fodd bynnag, ni chofnodwyd pob un o'r rhain ar ffurflenni casglu data, felly bydd yr ystadegau a gyflwynir yn y datganiad hwn yn dangos tangyfrif o'r gweithgarwch gwirioneddol a ddigwyddodd.