-18.04% is the change from 837 to 686
Calculation steps:
[( 686 - 837 ) ÷ 837] x 100 = -18.04%
Formula
Percentage change = [(686 - 837) / 837] x 100
Subtract the new number by the original number
686 - 837 = -151
-151 ÷ 837 = -0.18040621266427717
-0.18040621266427717 x 100 = -18.04%