-98.63% is the change from 658 to 9
Calculation steps:
[( 9 - 658 ) ÷ 658] x 100 = -98.63%
Formula
Percentage change = [(9 - 658) / 658] x 100
Subtract the new number by the original number
9 - 658 = -649
-649 ÷ 658 = -0.986322188449848
-0.986322188449848 x 100 = -98.63%