In the week beginning 7 December 2020 there was a decrease of approximately 10.0 percentage points in the number of tests authorised within one calendar day compared to the previous week.
Yn yr wythnos yn dechrau ar 7 Rhagfyr 2020 bu gostyngiad o tua 10.0 pwynt canran yn nifer y profion a awdurdodwyd o fewn un diwrnod calendr o gymharu â'r wythnos flaenorol.