-27.46% is the change from 539 to 391
Calculation steps:
[( 391 - 539 ) ÷ 539] x 100 = -27.46%
Formula
Percentage change = [(391 - 539) / 539] x 100
Subtract the new number by the original number
391 - 539 = -148
-148 ÷ 539 = -0.274582560296846
-0.274582560296846 x 100 = -27.46%