-16.31% is the change from 993 to 831
Calculation steps:
[( 831 - 993 ) ÷ 993] x 100 = -16.31%
Formula
Percentage change = [(831 - 993) / 993] x 100
Subtract the new number by the original number
831 - 993 = -162
-162 ÷ 993 = -0.16314199395770393
-0.16314199395770393 x 100 = -16.31%