-20.8% is the change from 870 to 689
Calculation steps:
[( 689 - 870 ) ÷ 870] x 100 = -20.8%
Formula
Percentage change = [(689 - 870) / 870] x 100
Subtract the new number by the original number
689 - 870 = -181
-181 ÷ 870 = -0.20804597701149424
-0.20804597701149424 x 100 = -20.8%