-18.24% is the change from 839 to 686
Calculation steps:
[( 686 - 839 ) ÷ 839] x 100 = -18.24%
Formula
Percentage change = [(686 - 839) / 839] x 100
Subtract the new number by the original number
686 - 839 = -153
-153 ÷ 839 = -0.18235995232419547
-0.18235995232419547 x 100 = -18.24%