-40.86% is the change from 580 to 343
Calculation steps:
[( 343 - 580 ) ÷ 580] x 100 = -40.86%
Formula
Percentage change = [(343 - 580) / 580] x 100
Subtract the new number by the original number
343 - 580 = -237
-237 ÷ 580 = -0.4086206896551724
-0.4086206896551724 x 100 = -40.86%