-50.79% is the change from 819 to 403
Calculation steps:
[( 403 - 819 ) ÷ 819] x 100 = -50.79%
Formula
Percentage change = [(403 - 819) / 819] x 100
Subtract the new number by the original number
403 - 819 = -416
-416 ÷ 819 = -0.5079365079365079
-0.5079365079365079 x 100 = -50.79%