-80% is the change from 685 to 137
Calculation steps:
[( 137 - 685 ) ÷ 685] x 100 = -80%
Formula
Percentage change = [(137 - 685) / 685] x 100
Subtract the new number by the original number
137 - 685 = -548
-548 ÷ 685 = -0.8
-0.8 x 100 = -80%
Example