These are marked increases which may reflect the change in mode or are a result of the pandemic or a combination of both, further analysis is needed to explore this.
Dyma gynnydd amlwg, a allai adlewyrchu'r newid yn y dull casglu neu fod o ganlyniad i'r pandemig neu gyfuniad o'r ddau, mae angen dadansoddiad pellach i edrych ar hyn.