-51.1% is the change from 818 to 400
Calculation steps:
[( 400 - 818 ) ÷ 818] x 100 = -51.1%
Formula
Percentage change = [(400 - 818) / 818] x 100
Subtract the new number by the original number
400 - 818 = -418
-418 ÷ 818 = -0.511002444987775
-0.511002444987775 x 100 = -51.1%