-75.39% is the change from 256 to 63
Calculation steps:
[( 63 - 256 ) ÷ 256] x 100 = -75.39%
Formula
Percentage change = [(63 - 256) / 256] x 100
Subtract the new number by the original number
63 - 256 = -193
-193 ÷ 256 = -0.75390625
-0.75390625 x 100 = -75.39%