The deficit shown is the excess of imports over exports. For that decade, it is £896, which is 1.109 times the level of exports (£808).
Imports were 110.9% more than exports for that period.
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Whenever you talk in terms of percentages, you need to be very clear about what the base or reference is. Generally, when you say B is some percentage more than A, you're taking A to be the reference or base. The excess is computed as (B/A -1)×100%, or ((B-A)/A)×100%.