-24.12% is the change from 821 to 623
Calculation steps:
[( 623 - 821 ) ÷ 821] x 100 = -24.12%
Formula
Percentage change = [(623 - 821) / 821] x 100
Subtract the new number by the original number
623 - 821 = -198
-198 ÷ 821 = -0.24116930572472595
-0.24116930572472595 x 100 = -24.12%