-70.51% is the change from 868 to 256
Calculation steps:
[( 256 - 868 ) ÷ 868] x 100 = -70.51%
Formula
Percentage change = [(256 - 868) / 868] x 100
Subtract the new number by the original number
256 - 868 = -612
-612 ÷ 868 = -0.7050691244239631
-0.7050691244239631 x 100 = -70.51%