-62.19% is the change from 677 to 256
Calculation steps:
[( 256 - 677 ) ÷ 677] x 100 = -62.19%
Formula
Percentage change = [(256 - 677) / 677] x 100
Subtract the new number by the original number
256 - 677 = -421
-421 ÷ 677 = -0.621861152141802
-0.621861152141802 x 100 = -62.19%