-50.06% is the change from 811 to 405
Calculation steps:
[( 405 - 811 ) ÷ 811] x 100 = -50.06%
Formula
Percentage change = [(405 - 811) / 811] x 100
Subtract the new number by the original number
405 - 811 = -406
-406 ÷ 811 = -0.5006165228113441
-0.5006165228113441 x 100 = -50.06%