-15.81% is the change from 987 to 831
Calculation steps:
[( 831 - 987 ) ÷ 987] x 100 = -15.81%
Formula
Percentage change = [(831 - 987) / 987] x 100
Subtract the new number by the original number
831 - 987 = -156
-156 ÷ 987 = -0.1580547112462006
-0.1580547112462006 x 100 = -15.81%