-74.37% is the change from 999 to 256
Calculation steps:
[( 256 - 999 ) ÷ 999] x 100 = -74.37%
Formula
Percentage change = [(256 - 999) / 999] x 100
Subtract the new number by the original number
256 - 999 = -743
-743 ÷ 999 = -0.7437437437437437
-0.7437437437437437 x 100 = -74.37%