-6.86% is the change from 539 to 502
Calculation steps:
[( 502 - 539 ) ÷ 539] x 100 = -6.86%
Formula
Percentage change = [(502 - 539) / 539] x 100
Subtract the new number by the original number
502 - 539 = -37
-37 ÷ 539 = -0.0686456400742115
-0.0686456400742115 x 100 = -6.86%