-61.73% is the change from 669 to 256
Calculation steps:
[( 256 - 669 ) ÷ 669] x 100 = -61.73%
Formula
Percentage change = [(256 - 669) / 669] x 100
Subtract the new number by the original number
256 - 669 = -413
-413 ÷ 669 = -0.617339312406577
-0.617339312406577 x 100 = -61.73%