-40.05% is the change from 819 to 491
Calculation steps:
[( 491 - 819 ) ÷ 819] x 100 = -40.05%
Formula
Percentage change = [(491 - 819) / 819] x 100
Subtract the new number by the original number
491 - 819 = -328
-328 ÷ 819 = -0.4004884004884005
-0.4004884004884005 x 100 = -40.05%