-47.01% is the change from 819 to 434
Calculation steps:
[( 434 - 819 ) ÷ 819] x 100 = -47.01%
Formula
Percentage change = [(434 - 819) / 819] x 100
Subtract the new number by the original number
434 - 819 = -385
-385 ÷ 819 = -0.4700854700854701
-0.4700854700854701 x 100 = -47.01%