-16.58% is the change from 603 to 503
Calculation steps:
[( 503 - 603 ) ÷ 603] x 100 = -16.58%
Formula
Percentage change = [(503 - 603) / 603] x 100
Subtract the new number by the original number
503 - 603 = -100
-100 ÷ 603 = -0.16583747927031509
-0.16583747927031509 x 100 = -16.58%