-50.68% is the change from 811 to 400
Calculation steps:
[( 400 - 811 ) ÷ 811] x 100 = -50.68%
Formula
Percentage change = [(400 - 811) / 811] x 100
Subtract the new number by the original number
400 - 811 = -411
-411 ÷ 811 = -0.5067817509247842
-0.5067817509247842 x 100 = -50.68%