-9.1% is the change from 923 to 839
Calculation steps:
[( 839 - 923 ) ÷ 923] x 100 = -9.1%
Formula
Percentage change = [(839 - 923) / 923] x 100
Subtract the new number by the original number
839 - 923 = -84
-84 ÷ 923 = -0.09100758396533044
-0.09100758396533044 x 100 = -9.1%