-50.31% is the change from 819 to 407
Calculation steps:
[( 407 - 819 ) ÷ 819] x 100 = -50.31%
Formula
Percentage change = [(407 - 819) / 819] x 100
Subtract the new number by the original number
407 - 819 = -412
-412 ÷ 819 = -0.503052503052503
-0.503052503052503 x 100 = -50.31%