-8.8% is the change from 920 to 839
Calculation steps:
[( 839 - 920 ) ÷ 920] x 100 = -8.8%
Formula
Percentage change = [(839 - 920) / 920] x 100
Subtract the new number by the original number
839 - 920 = -81
-81 ÷ 920 = -0.08804347826086957
-0.08804347826086957 x 100 = -8.8%