-79.74% is the change from 686 to 139
Calculation steps:
[( 139 - 686 ) ÷ 686] x 100 = -79.74%
Formula
Percentage change = [(139 - 686) / 686] x 100
Subtract the new number by the original number
139 - 686 = -547
-547 ÷ 686 = -0.7973760932944607
-0.7973760932944607 x 100 = -79.74%