-17.94% is the change from 836 to 686
Calculation steps:
[( 686 - 836 ) ÷ 836] x 100 = -17.94%
Formula
Percentage change = [(686 - 836) / 836] x 100
Subtract the new number by the original number
686 - 836 = -150
-150 ÷ 836 = -0.17942583732057416
-0.17942583732057416 x 100 = -17.94%