-39.53% is the change from 817 to 494
Calculation steps:
[( 494 - 817 ) ÷ 817] x 100 = -39.53%
Formula
Percentage change = [(494 - 817) / 817] x 100
Subtract the new number by the original number
494 - 817 = -323
-323 ÷ 817 = -0.3953488372093023
-0.3953488372093023 x 100 = -39.53%