-97.52% is the change from 604 to 15
Calculation steps:
[( 15 - 604 ) ÷ 604] x 100 = -97.52%
Formula
Percentage change = [(15 - 604) / 604] x 100
Subtract the new number by the original number
15 - 604 = -589
-589 ÷ 604 = -0.9751655629139073
-0.9751655629139073 x 100 = -97.52%