-48.35% is the change from 819 to 423
Calculation steps:
[( 423 - 819 ) ÷ 819] x 100 = -48.35%
Formula
Percentage change = [(423 - 819) / 819] x 100
Subtract the new number by the original number
423 - 819 = -396
-396 ÷ 819 = -0.4835164835164835
-0.4835164835164835 x 100 = -48.35%