-98.65% is the change from 667 to 9
Calculation steps:
[( 9 - 667 ) ÷ 667] x 100 = -98.65%
Formula
Percentage change = [(9 - 667) / 667] x 100
Subtract the new number by the original number
9 - 667 = -658
-658 ÷ 667 = -0.9865067466266867
-0.9865067466266867 x 100 = -98.65%