-24.54% is the change from 823 to 621
Calculation steps:
[( 621 - 823 ) ÷ 823] x 100 = -24.54%
Formula
Percentage change = [(621 - 823) / 823] x 100
Subtract the new number by the original number
621 - 823 = -202
-202 ÷ 823 = -0.2454434993924666
-0.2454434993924666 x 100 = -24.54%