-27.64% is the change from 539 to 390
Calculation steps:
[( 390 - 539 ) ÷ 539] x 100 = -27.64%
Formula
Percentage change = [(390 - 539) / 539] x 100
Subtract the new number by the original number
390 - 539 = -149
-149 ÷ 539 = -0.2764378478664193
-0.2764378478664193 x 100 = -27.64%