-15.93% is the change from 816 to 686
Calculation steps:
[( 686 - 816 ) ÷ 816] x 100 = -15.93%
Formula
Percentage change = [(686 - 816) / 816] x 100
Subtract the new number by the original number
686 - 816 = -130
-130 ÷ 816 = -0.15931372549019607
-0.15931372549019607 x 100 = -15.93%