-98.67% is the change from 677 to 9
Calculation steps:
[( 9 - 677 ) ÷ 677] x 100 = -98.67%
Formula
Percentage change = [(9 - 677) / 677] x 100
Subtract the new number by the original number
9 - 677 = -668
-668 ÷ 677 = -0.9867060561299852
-0.9867060561299852 x 100 = -98.67%