-70.69% is the change from 580 to 170
Calculation steps:
[( 170 - 580 ) ÷ 580] x 100 = -70.69%
Formula
Percentage change = [(170 - 580) / 580] x 100
Subtract the new number by the original number
170 - 580 = -410
-410 ÷ 580 = -0.7068965517241379
-0.7068965517241379 x 100 = -70.69%