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: Mark Stephens
Dyddiad y datganiad: 29 June 2018
View previous versions
Cyhoeddiad nesaf: 10 July 2018
ID y gyfres: JQ3R
Beth yw hyn?
Custom time period
Download full time series as:
Download filtered time series as: