-98.58% is the change from 634 to 9
Calculation steps:
[( 9 - 634 ) ÷ 634] x 100 = -98.58%
Formula
Percentage change = [(9 - 634) / 634] x 100
Subtract the new number by the original number
9 - 634 = -625
-625 ÷ 634 = -0.9858044164037855
-0.9858044164037855 x 100 = -98.58%