-16.77% is the change from 638 to 531
Calculation steps:
[( 531 - 638 ) ÷ 638] x 100 = -16.77%
Formula
Percentage change = [(531 - 638) / 638] x 100
Subtract the new number by the original number
531 - 638 = -107
-107 ÷ 638 = -0.1677115987460815
-0.1677115987460815 x 100 = -16.77%