3.55% is the change from 957 to 991
Calculation steps:
[( 991 - 957 ) ÷ 957] x 100 = 3.55%
Formula
Percentage change = [(991 - 957) / 957] x 100
Subtract the new number by the original number
991 - 957 = 34
34 ÷ 957 = 0.035527690700104496
0.035527690700104496 x 100 = 3.55%