-97.51% is the change from 603 to 15
Calculation steps:
[( 15 - 603 ) ÷ 603] x 100 = -97.51%
Formula
Percentage change = [(15 - 603) / 603] x 100
Subtract the new number by the original number
15 - 603 = -588
-588 ÷ 603 = -0.9751243781094527
-0.9751243781094527 x 100 = -97.51%