-6.91% is the change from 579 to 539
Calculation steps:
[( 539 - 579 ) ÷ 579] x 100 = -6.91%
Formula
Percentage change = [(539 - 579) / 579] x 100
Subtract the new number by the original number
539 - 579 = -40
-40 ÷ 579 = -0.0690846286701209
-0.0690846286701209 x 100 = -6.91%