However, call volumes have reduced during the COVID-19 pandemic, with April 2020 having the fewest daily average number of calls since May 2011.
Fodd bynnag, mae nifer y galwadau wedi gostwng yn ystod pandemig COVID-19, gyda mis Ebrill 2020 yn gweld y nifer cyfartalog dyddiol isaf o alwadau ers mis Mai 2011.