-83.54% is the change from 638 to 105
Calculation steps:
[( 105 - 638 ) ÷ 638] x 100 = -83.54%
Formula
Percentage change = [(105 - 638) / 638] x 100
Subtract the new number by the original number
105 - 638 = -533
-533 ÷ 638 = -0.835423197492163
-0.835423197492163 x 100 = -83.54%