-98.68% is the change from 680 to 9
Calculation steps:
[( 9 - 680 ) ÷ 680] x 100 = -98.68%
Formula
Percentage change = [(9 - 680) / 680] x 100
Subtract the new number by the original number
9 - 680 = -671
-671 ÷ 680 = -0.986764705882353
-0.986764705882353 x 100 = -98.68%