-25.39% is the change from 256 to 191
Calculation steps:
[( 191 - 256 ) ÷ 256] x 100 = -25.39%
Formula
Percentage change = [(191 - 256) / 256] x 100
Subtract the new number by the original number
191 - 256 = -65
-65 ÷ 256 = -0.25390625
-0.25390625 x 100 = -25.39%