-31.51% is the change from 584 to 400
Calculation steps:
[( 400 - 584 ) ÷ 584] x 100 = -31.51%
Formula
Percentage change = [(400 - 584) / 584] x 100
Subtract the new number by the original number
400 - 584 = -184
-184 ÷ 584 = -0.3150684931506849
-0.3150684931506849 x 100 = -31.51%