-4.28% is the change from 538 to 515
Calculation steps:
[( 515 - 538 ) ÷ 538] x 100 = -4.28%
Formula
Percentage change = [(515 - 538) / 538] x 100
Subtract the new number by the original number
515 - 538 = -23
-23 ÷ 538 = -0.04275092936802974
-0.04275092936802974 x 100 = -4.28%