-47.74% is the change from 819 to 428
Calculation steps:
[( 428 - 819 ) ÷ 819] x 100 = -47.74%
Formula
Percentage change = [(428 - 819) / 819] x 100
Subtract the new number by the original number
428 - 819 = -391
-391 ÷ 819 = -0.47741147741147744
-0.47741147741147744 x 100 = -47.74%