-97.16% is the change from 528 to 15
Calculation steps:
[( 15 - 528 ) ÷ 528] x 100 = -97.16%
Formula
Percentage change = [(15 - 528) / 528] x 100
Subtract the new number by the original number
15 - 528 = -513
-513 ÷ 528 = -0.9715909090909091
-0.9715909090909091 x 100 = -97.16%