-50.43% is the change from 819 to 406
Calculation steps:
[( 406 - 819 ) ÷ 819] x 100 = -50.43%
Formula
Percentage change = [(406 - 819) / 819] x 100
Subtract the new number by the original number
406 - 819 = -413
-413 ÷ 819 = -0.5042735042735043
-0.5042735042735043 x 100 = -50.43%