-21.5% is the change from 879 to 690
Calculation steps:
[( 690 - 879 ) ÷ 879] x 100 = -21.5%
Formula
Percentage change = [(690 - 879) / 879] x 100
Subtract the new number by the original number
690 - 879 = -189
-189 ÷ 879 = -0.2150170648464164
-0.2150170648464164 x 100 = -21.5%