-46.4% is the change from 819 to 439
Calculation steps:
[( 439 - 819 ) ÷ 819] x 100 = -46.4%
Formula
Percentage change = [(439 - 819) / 819] x 100
Subtract the new number by the original number
439 - 819 = -380
-380 ÷ 819 = -0.463980463980464
-0.463980463980464 x 100 = -46.4%