-21.42% is the change from 873 to 686
Calculation steps:
[( 686 - 873 ) ÷ 873] x 100 = -21.42%
Formula
Percentage change = [(686 - 873) / 873] x 100
Subtract the new number by the original number
686 - 873 = -187
-187 ÷ 873 = -0.21420389461626574
-0.21420389461626574 x 100 = -21.42%