-39.09% is the change from 811 to 494
Calculation steps:
[( 494 - 811 ) ÷ 811] x 100 = -39.09%
Formula
Percentage change = [(494 - 811) / 811] x 100
Subtract the new number by the original number
494 - 811 = -317
-317 ÷ 811 = -0.3908754623921085
-0.3908754623921085 x 100 = -39.09%