-98.57% is the change from 631 to 9
Calculation steps:
[( 9 - 631 ) ÷ 631] x 100 = -98.57%
Formula
Percentage change = [(9 - 631) / 631] x 100
Subtract the new number by the original number
9 - 631 = -622
-622 ÷ 631 = -0.9857369255150554
-0.9857369255150554 x 100 = -98.57%