-39.17% is the change from 817 to 497
Calculation steps:
[( 497 - 817 ) ÷ 817] x 100 = -39.17%
Formula
Percentage change = [(497 - 817) / 817] x 100
Subtract the new number by the original number
497 - 817 = -320
-320 ÷ 817 = -0.39167686658506734
-0.39167686658506734 x 100 = -39.17%