-17.58% is the change from 256 to 211
Calculation steps:
[( 211 - 256 ) ÷ 256] x 100 = -17.58%
Formula
Percentage change = [(211 - 256) / 256] x 100
Subtract the new number by the original number
211 - 256 = -45
-45 ÷ 256 = -0.17578125
-0.17578125 x 100 = -17.58%