-51.6% is the change from 812 to 393
Calculation steps:
[( 393 - 812 ) ÷ 812] x 100 = -51.6%
Formula
Percentage change = [(393 - 812) / 812] x 100
Subtract the new number by the original number
393 - 812 = -419
-419 ÷ 812 = -0.5160098522167488
-0.5160098522167488 x 100 = -51.6%