-97.41% is the change from 580 to 15
Calculation steps:
[( 15 - 580 ) ÷ 580] x 100 = -97.41%
Formula
Percentage change = [(15 - 580) / 580] x 100
Subtract the new number by the original number
15 - 580 = -565
-565 ÷ 580 = -0.9741379310344828
-0.9741379310344828 x 100 = -97.41%