-19.31% is the change from 839 to 677
Calculation steps:
[( 677 - 839 ) ÷ 839] x 100 = -19.31%
Formula
Percentage change = [(677 - 839) / 839] x 100
Subtract the new number by the original number
677 - 839 = -162
-162 ÷ 839 = -0.19308700834326578
-0.19308700834326578 x 100 = -19.31%