-16.5% is the change from 406 to 339
Calculation steps:
[( 339 - 406 ) ÷ 406] x 100 = -16.5%
Formula
Percentage change = [(339 - 406) / 406] x 100
Subtract the new number by the original number
339 - 406 = -67
-67 ÷ 406 = -0.16502463054187191
-0.16502463054187191 x 100 = -16.5%