-5.35% is the change from 991 to 938
Calculation steps:
[( 938 - 991 ) ÷ 991] x 100 = -5.35%
Formula
Percentage change = [(938 - 991) / 991] x 100
Subtract the new number by the original number
938 - 991 = -53
-53 ÷ 991 = -0.05348133198789102
-0.05348133198789102 x 100 = -5.35%