-97.78% is the change from 406 to 9
Calculation steps:
[( 9 - 406 ) ÷ 406] x 100 = -97.78%
Formula
Percentage change = [(9 - 406) / 406] x 100
Subtract the new number by the original number
9 - 406 = -397
-397 ÷ 406 = -0.9778325123152709
-0.9778325123152709 x 100 = -97.78%