-6.49% is the change from 539 to 504
Calculation steps:
[( 504 - 539 ) ÷ 539] x 100 = -6.49%
Formula
Percentage change = [(504 - 539) / 539] x 100
Subtract the new number by the original number
504 - 539 = -35
-35 ÷ 539 = -0.06493506493506493
-0.06493506493506493 x 100 = -6.49%