-69.63% is the change from 843 to 256
Calculation steps:
[( 256 - 843 ) ÷ 843] x 100 = -69.63%
Formula
Percentage change = [(256 - 843) / 843] x 100
Subtract the new number by the original number
256 - 843 = -587
-587 ÷ 843 = -0.6963226571767497
-0.6963226571767497 x 100 = -69.63%