Yes, and GDP increase per year would be the commonly-accepted standard: they should have said 0.03% (which anyone would recognise as a rounding error). They've

Yes, and GDP increase per year would be the commonly-accepted standard: they should have said 0.03% (which anyone would recognise as a rounding error). They've quoted 0.4% to make it sound better than it is. This is a standard psychological trick. Strictly speaking the calculation is the 13th root of 1.04