-68.43% is the change from 811 to 256
Calculation steps:
[( 256 - 811 ) ÷ 811] x 100 = -68.43%
Formula
Percentage change = [(256 - 811) / 811] x 100
Subtract the new number by the original number
256 - 811 = -555
-555 ÷ 811 = -0.6843403205918619
-0.6843403205918619 x 100 = -68.43%