-20.04% is the change from 539 to 431
Calculation steps:
[( 431 - 539 ) ÷ 539] x 100 = -20.04%
Formula
Percentage change = [(431 - 539) / 539] x 100
Subtract the new number by the original number
431 - 539 = -108
-108 ÷ 539 = -0.20037105751391465
-0.20037105751391465 x 100 = -20.04%