-97.72% is the change from 658 to 15
Calculation steps:
[( 15 - 658 ) ÷ 658] x 100 = -97.72%
Formula
Percentage change = [(15 - 658) / 658] x 100
Subtract the new number by the original number
15 - 658 = -643
-643 ÷ 658 = -0.9772036474164134
-0.9772036474164134 x 100 = -97.72%