-39.22% is the change from 821 to 499
Calculation steps:
[( 499 - 821 ) ÷ 821] x 100 = -39.22%
Formula
Percentage change = [(499 - 821) / 821] x 100
Subtract the new number by the original number
499 - 821 = -322
-322 ÷ 821 = -0.392204628501827
-0.392204628501827 x 100 = -39.22%