55.57% is the change from 637 to 991
Calculation steps:
[( 991 - 637 ) ÷ 637] x 100 = 55.57%
Formula
Percentage change = [(991 - 637) / 637] x 100
Subtract the new number by the original number
991 - 637 = 354
354 ÷ 637 = 0.5557299843014128
0.5557299843014128 x 100 = 55.57%