-40.33% is the change from 429 to 256
Calculation steps:
[( 256 - 429 ) ÷ 429] x 100 = -40.33%
Formula
Percentage change = [(256 - 429) / 429] x 100
Subtract the new number by the original number
256 - 429 = -173
-173 ÷ 429 = -0.40326340326340326
-0.40326340326340326 x 100 = -40.33%