The last time UK aid spend was at or below 0.3% of GNI was in 1999

Actual and forecast UK overseas aid, 1999-2029, based on Office for Budget Responsibility (OBR) Gross National Income (GNI) estimates (£bn)

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'GNI' refers to 'Gross National Income', and is the baseline against which the UK government currently calculates overseas aid.

Source: House of Commons Library, FCDO