-39.9% is the change from 817 to 491
Calculation steps:
[( 491 - 817 ) ÷ 817] x 100 = -39.9%
Formula
Percentage change = [(491 - 817) / 817] x 100
Subtract the new number by the original number
491 - 817 = -326
-326 ÷ 817 = -0.3990208078335373
-0.3990208078335373 x 100 = -39.9%