-17.24% is the change from 638 to 528
Calculation steps:
[( 528 - 638 ) ÷ 638] x 100 = -17.24%
Formula
Percentage change = [(528 - 638) / 638] x 100
Subtract the new number by the original number
528 - 638 = -110
-110 ÷ 638 = -0.1724137931034483
-0.1724137931034483 x 100 = -17.24%