-35.52% is the change from 397 to 256
Calculation steps:
[( 256 - 397 ) ÷ 397] x 100 = -35.52%
Formula
Percentage change = [(256 - 397) / 397] x 100
Subtract the new number by the original number
256 - 397 = -141
-141 ÷ 397 = -0.35516372795969775
-0.35516372795969775 x 100 = -35.52%