-79.77% is the change from 687 to 139
Calculation steps:
[( 139 - 687 ) ÷ 687] x 100 = -79.77%
Formula
Percentage change = [(139 - 687) / 687] x 100
Subtract the new number by the original number
139 - 687 = -548
-548 ÷ 687 = -0.7976710334788938
-0.7976710334788938 x 100 = -79.77%