-21.39% is the change from 879 to 691
Calculation steps:
[( 691 - 879 ) ÷ 879] x 100 = -21.39%
Formula
Percentage change = [(691 - 879) / 879] x 100
Subtract the new number by the original number
691 - 879 = -188
-188 ÷ 879 = -0.21387940841865757
-0.21387940841865757 x 100 = -21.39%