At any given growth rate the absolute increase in any fixed period (say a 5 year period) will be greater than in the previous period).
The Prime Minister must not take credit for algebra.
In a chart.
1 .2 Trn in 27 years
2.4 trillion in the next 9 years
4.8 trillion in the next 9 years.
1 Trn in first 27 years
1.2 in next 9 years
2.4 in next 9 years.
Only an ignoramus in simple school algebra, or a fraud, or both would claim that the performance was best in the final 9-year period. It was 8% throughout.