-5.39% is the change from 538 to 509
Calculation steps:
[( 509 - 538 ) ÷ 538] x 100 = -5.39%
Formula
Percentage change = [(509 - 538) / 538] x 100
Subtract the new number by the original number
509 - 538 = -29
-29 ÷ 538 = -0.05390334572490706
-0.05390334572490706 x 100 = -5.39%