-96.32% is the change from 843 to 31
Calculation steps:
[( 31 - 843 ) ÷ 843] x 100 = -96.32%
Formula
Percentage change = [(31 - 843) / 843] x 100
Subtract the new number by the original number
31 - 843 = -812
-812 ÷ 843 = -0.963226571767497
-0.963226571767497 x 100 = -96.32%