-18.55% is the change from 539 to 439
Calculation steps:
[( 439 - 539 ) ÷ 539] x 100 = -18.55%
Formula
Percentage change = [(439 - 539) / 539] x 100
Subtract the new number by the original number
439 - 539 = -100
-100 ÷ 539 = -0.18552875695732837
-0.18552875695732837 x 100 = -18.55%
Example