-39.32% is the change from 819 to 497
Calculation steps:
[( 497 - 819 ) ÷ 819] x 100 = -39.32%
Formula
Percentage change = [(497 - 819) / 819] x 100
Subtract the new number by the original number
497 - 819 = -322
-322 ÷ 819 = -0.39316239316239315
-0.39316239316239315 x 100 = -39.32%