-50.3% is the change from 823 to 409
Calculation steps:
[( 409 - 823 ) ÷ 823] x 100 = -50.3%
Formula
Percentage change = [(409 - 823) / 823] x 100
Subtract the new number by the original number
409 - 823 = -414
-414 ÷ 823 = -0.503037667071689
-0.503037667071689 x 100 = -50.3%