Comparing growth like that is misleading.That is why it is used.

We've already had previous growth and the others are catching up to a similar overall level.
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It means the UK will go from the second-fastest growing economy in the G7 group of industrial nations to the slowest growing in 2023.
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What would be the situation if you compared prior to that point to one next year?
EG If X has an increase of 2% first year and 1% the next, and Y has an increase of 1% first year and 2% the next, they are comparable overall. Yet Y has a larger increase in the 2nd year, when looked at in isolation.