-51.72% is the change from 812 to 392
Calculation steps:
[( 392 - 812 ) ÷ 812] x 100 = -51.72%
Formula
Percentage change = [(392 - 812) / 812] x 100
Subtract the new number by the original number
392 - 812 = -420
-420 ÷ 812 = -0.5172413793103449
-0.5172413793103449 x 100 = -51.72%