The data is provided by Eurostat. An EU organisation, they are not going to fund numbers for a country not in the EU anymore (some other countries might still join for various reasons.)
If they hold that stance, the graph should not use ‘Europe’ when they essentially mean ‘EU member nations’, especially if they omit the UK for the reasons you state as the UK is a part of Europe.
The data is provided by Eurostat. An EU organisation, they are not going to fund numbers for a country not in the EU anymore (some other countries might still join for various reasons.)
If they hold that stance, the graph should not use ‘Europe’ when they essentially mean ‘EU member nations’, especially if they omit the UK for the reasons you state as the UK is a part of Europe.