-18.74% is the change from 539 to 438
Calculation steps:
[( 438 - 539 ) ÷ 539] x 100 = -18.74%
Formula
Percentage change = [(438 - 539) / 539] x 100
Subtract the new number by the original number
438 - 539 = -101
-101 ÷ 539 = -0.18738404452690166
-0.18738404452690166 x 100 = -18.74%