-1.56% is the change from 256 to 252
Calculation steps:
[( 252 - 256 ) ÷ 256] x 100 = -1.56%
Formula
Percentage change = [(252 - 256) / 256] x 100
Subtract the new number by the original number
252 - 256 = -4
-4 ÷ 256 = -0.015625
-0.015625 x 100 = -1.56%