-83.9% is the change from 677 to 109
Calculation steps:
[( 109 - 677 ) ÷ 677] x 100 = -83.9%
Formula
Percentage change = [(109 - 677) / 677] x 100
Subtract the new number by the original number
109 - 677 = -568
-568 ÷ 677 = -0.8389955686853766
-0.8389955686853766 x 100 = -83.9%