-15.51% is the change from 303 to 256
Calculation steps:
[( 256 - 303 ) ÷ 303] x 100 = -15.51%
Formula
Percentage change = [(256 - 303) / 303] x 100
Subtract the new number by the original number
256 - 303 = -47
-47 ÷ 303 = -0.1551155115511551
-0.1551155115511551 x 100 = -15.51%