We use this information to make the website work as well as possible and improve our services.
You’ve accepted all cookies. You can change your cookie settings at any time.
Cyswllt: Rhys Lewis
Dyddiad y datganiad: 19 November 2021
View previous versions
Cyhoeddiad nesaf: 17 December 2021
ID y gyfres: J4MC
Beth yw hyn?
Custom time period
Download full time series as:
Download filtered time series as: