-17.75% is the change from 834 to 686
Calculation steps:
[( 686 - 834 ) ÷ 834] x 100 = -17.75%
Formula
Percentage change = [(686 - 834) / 834] x 100
Subtract the new number by the original number
686 - 834 = -148
-148 ÷ 834 = -0.1774580335731415
-0.1774580335731415 x 100 = -17.75%