-15.72% is the change from 986 to 831
Calculation steps:
[( 831 - 986 ) ÷ 986] x 100 = -15.72%
Formula
Percentage change = [(831 - 986) / 986] x 100
Subtract the new number by the original number
831 - 986 = -155
-155 ÷ 986 = -0.15720081135902636
-0.15720081135902636 x 100 = -15.72%