-23.39% is the change from 821 to 629
Calculation steps:
[( 629 - 821 ) ÷ 821] x 100 = -23.39%
Formula
Percentage change = [(629 - 821) / 821] x 100
Subtract the new number by the original number
629 - 821 = -192
-192 ÷ 821 = -0.23386114494518878
-0.23386114494518878 x 100 = -23.39%