-97.58% is the change from 619 to 15
Calculation steps:
[( 15 - 619 ) ÷ 619] x 100 = -97.58%
Formula
Percentage change = [(15 - 619) / 619] x 100
Subtract the new number by the original number
15 - 619 = -604
-604 ÷ 619 = -0.975767366720517
-0.975767366720517 x 100 = -97.58%