-2.02% is the change from 939 to 920
Calculation steps:
[( 920 - 939 ) ÷ 939] x 100 = -2.02%
Formula
Percentage change = [(920 - 939) / 939] x 100
Subtract the new number by the original number
920 - 939 = -19
-19 ÷ 939 = -0.02023429179978701
-0.02023429179978701 x 100 = -2.02%