-3.24% is the change from 556 to 538
Calculation steps:
[( 538 - 556 ) ÷ 556] x 100 = -3.24%
Formula
Percentage change = [(538 - 556) / 556] x 100
Subtract the new number by the original number
538 - 556 = -18
-18 ÷ 556 = -0.03237410071942446
-0.03237410071942446 x 100 = -3.24%