The comma after figures marks the beginning of a non-restrictive clause: which are a measure of a country’s wealth. If a non-restrictive clause appears in mid-sentence, its end point should be marked with a comma too:
The figures, which are a measure of a country’s wealth, included both financial and non-financial UK assets.
Source
‘UK worth £7tn – but mainly in bricks and mortar’, The Guardian, 29 October 2008, p. 7
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© Twenty-six Letters 2008