-0.84% is the change from 838 to 831
Calculation steps:
[( 831 - 838 ) ÷ 838] x 100 = -0.84%
Formula
Percentage change = [(831 - 838) / 838] x 100
Subtract the new number by the original number
831 - 838 = -7
-7 ÷ 838 = -0.008353221957040573
-0.008353221957040573 x 100 = -0.84%