-15.99% is the change from 638 to 536
Calculation steps:
[( 536 - 638 ) ÷ 638] x 100 = -15.99%
Formula
Percentage change = [(536 - 638) / 638] x 100
Subtract the new number by the original number
536 - 638 = -102
-102 ÷ 638 = -0.15987460815047022
-0.15987460815047022 x 100 = -15.99%