-97.22% is the change from 539 to 15
Calculation steps:
[( 15 - 539 ) ÷ 539] x 100 = -97.22%
Formula
Percentage change = [(15 - 539) / 539] x 100
Subtract the new number by the original number
15 - 539 = -524
-524 ÷ 539 = -0.9721706864564007
-0.9721706864564007 x 100 = -97.22%