-3.94% is the change from 406 to 390
Calculation steps:
[( 390 - 406 ) ÷ 406] x 100 = -3.94%
Formula
Percentage change = [(390 - 406) / 406] x 100
Subtract the new number by the original number
390 - 406 = -16
-16 ÷ 406 = -0.03940886699507389
-0.03940886699507389 x 100 = -3.94%