-50.25% is the change from 816 to 406
Calculation steps:
[( 406 - 816 ) ÷ 816] x 100 = -50.25%
Formula
Percentage change = [(406 - 816) / 816] x 100
Subtract the new number by the original number
406 - 816 = -410
-410 ÷ 816 = -0.5024509803921569
-0.5024509803921569 x 100 = -50.25%