-98.75% is the change from 638 to 8
Calculation steps:
[( 8 - 638 ) ÷ 638] x 100 = -98.75%
Formula
Percentage change = [(8 - 638) / 638] x 100
Subtract the new number by the original number
8 - 638 = -630
-630 ÷ 638 = -0.987460815047022
-0.987460815047022 x 100 = -98.75%