-0.85% is the change from 939 to 931
Calculation steps:
[( 931 - 939 ) ÷ 939] x 100 = -0.85%
Formula
Percentage change = [(931 - 939) / 939] x 100
Subtract the new number by the original number
931 - 939 = -8
-8 ÷ 939 = -0.008519701810436636
-0.008519701810436636 x 100 = -0.85%