-21.81% is the change from 839 to 656
Calculation steps:
[( 656 - 839 ) ÷ 839] x 100 = -21.81%
Formula
Percentage change = [(656 - 839) / 839] x 100
Subtract the new number by the original number
656 - 839 = -183
-183 ÷ 839 = -0.21811680572109654
-0.21811680572109654 x 100 = -21.81%