-51.77% is the change from 821 to 396
Calculation steps:
[( 396 - 821 ) ÷ 821] x 100 = -51.77%
Formula
Percentage change = [(396 - 821) / 821] x 100
Subtract the new number by the original number
396 - 821 = -425
-425 ÷ 821 = -0.5176613885505481
-0.5176613885505481 x 100 = -51.77%