-8.71% is the change from 919 to 839
Calculation steps:
[( 839 - 919 ) ÷ 919] x 100 = -8.71%
Formula
Percentage change = [(839 - 919) / 919] x 100
Subtract the new number by the original number
839 - 919 = -80
-80 ÷ 919 = -0.08705114254624592
-0.08705114254624592 x 100 = -8.71%