-0.3% is the change from 991 to 988
Calculation steps:
[( 988 - 991 ) ÷ 991] x 100 = -0.3%
Formula
Percentage change = [(988 - 991) / 991] x 100
Subtract the new number by the original number
988 - 991 = -3
-3 ÷ 991 = -0.0030272452068617556
-0.0030272452068617556 x 100 = -0.3%