-98.3% is the change from 528 to 9
Calculation steps:
[( 9 - 528 ) ÷ 528] x 100 = -98.3%
Formula
Percentage change = [(9 - 528) / 528] x 100
Subtract the new number by the original number
9 - 528 = -519
-519 ÷ 528 = -0.9829545454545454
-0.9829545454545454 x 100 = -98.3%