-98.74% is the change from 636 to 8
Calculation steps:
[( 8 - 636 ) ÷ 636] x 100 = -98.74%
Formula
Percentage change = [(8 - 636) / 636] x 100
Subtract the new number by the original number
8 - 636 = -628
-628 ÷ 636 = -0.9874213836477987
-0.9874213836477987 x 100 = -98.74%