-6.51% is the change from 538 to 503
Calculation steps:
[( 503 - 538 ) ÷ 538] x 100 = -6.51%
Formula
Percentage change = [(503 - 538) / 538] x 100
Subtract the new number by the original number
503 - 538 = -35
-35 ÷ 538 = -0.06505576208178439
-0.06505576208178439 x 100 = -6.51%