-19.07% is the change from 839 to 679
Calculation steps:
[( 679 - 839 ) ÷ 839] x 100 = -19.07%
Formula
Percentage change = [(679 - 839) / 839] x 100
Subtract the new number by the original number
679 - 839 = -160
-160 ÷ 839 = -0.1907032181168057
-0.1907032181168057 x 100 = -19.07%