-40.52% is the change from 580 to 345
Calculation steps:
[( 345 - 580 ) ÷ 580] x 100 = -40.52%
Formula
Percentage change = [(345 - 580) / 580] x 100
Subtract the new number by the original number
345 - 580 = -235
-235 ÷ 580 = -0.4051724137931034
-0.4051724137931034 x 100 = -40.52%