-99.01% is the change from 406 to 4
Calculation steps:
[( 4 - 406 ) ÷ 406] x 100 = -99.01%
Formula
Percentage change = [(4 - 406) / 406] x 100
Subtract the new number by the original number
4 - 406 = -402
-402 ÷ 406 = -0.9901477832512315
-0.9901477832512315 x 100 = -99.01%