-21.96% is the change from 879 to 686
Calculation steps:
[( 686 - 879 ) ÷ 879] x 100 = -21.96%
Formula
Percentage change = [(686 - 879) / 879] x 100
Subtract the new number by the original number
686 - 879 = -193
-193 ÷ 879 = -0.21956769055745165
-0.21956769055745165 x 100 = -21.96%