02 November 2023

This dataset has been re-introduced following an overhaul of our data collection and processing systems, resulting in a level shift across the entire time series. The previous version of this dataset was last published on the 25 May 2023. While the trends observed in the dataset have largely remained consistent with previous releases, we advise against drawing direct comparisons between data from the 2 November 2023 release and that of prior releases, because of these systemic changes.