-83.07% is the change from 638 to 108
Calculation steps:
[( 108 - 638 ) ÷ 638] x 100 = -83.07%
Formula
Percentage change = [(108 - 638) / 638] x 100
Subtract the new number by the original number
108 - 638 = -530
-530 ÷ 638 = -0.8307210031347962
-0.8307210031347962 x 100 = -83.07%