The what? Sounds like the trade balance:
https://www.ons.gov.uk/economy/natio...anceofpayments
In your link the closest I find to the mentioned figures is:
Originally Posted by :
The latest statistics from the Annual Business Survey (ABS) reveal that 15.2%, a total of 310,800 businesses in the Non-Financial Business Economy in Great Britain (GB) engaged in international trade in 2014.
But engaging in international trade would refer to both imports and exports and it does not say anything about trade volume or percentage of economy, but businesses regardless of size and trade volume it would seem.
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