-70.34% is the change from 863 to 256
Calculation steps:
[( 256 - 863 ) ÷ 863] x 100 = -70.34%
Formula
Percentage change = [(256 - 863) / 863] x 100
Subtract the new number by the original number
256 - 863 = -607
-607 ÷ 863 = -0.7033603707995365
-0.7033603707995365 x 100 = -70.34%