-17.19% is the change from 256 to 212
Calculation steps:
[( 212 - 256 ) ÷ 256] x 100 = -17.19%
Formula
Percentage change = [(212 - 256) / 256] x 100
Subtract the new number by the original number
212 - 256 = -44
-44 ÷ 256 = -0.171875
-0.171875 x 100 = -17.19%