-98.67% is the change from 678 to 9
Calculation steps:
[( 9 - 678 ) ÷ 678] x 100 = -98.67%
Formula
Percentage change = [(9 - 678) / 678] x 100
Subtract the new number by the original number
9 - 678 = -669
-669 ÷ 678 = -0.9867256637168141
-0.9867256637168141 x 100 = -98.67%