-12.72% is the change from 637 to 556
Calculation steps:
[( 556 - 637 ) ÷ 637] x 100 = -12.72%
Formula
Percentage change = [(556 - 637) / 637] x 100
Subtract the new number by the original number
556 - 637 = -81
-81 ÷ 637 = -0.1271585557299843
-0.1271585557299843 x 100 = -12.72%