-0.49% is the change from 823 to 819
Calculation steps:
[( 819 - 823 ) ÷ 823] x 100 = -0.49%
Formula
Percentage change = [(819 - 823) / 823] x 100
Subtract the new number by the original number
819 - 823 = -4
-4 ÷ 823 = -0.004860267314702308
-0.004860267314702308 x 100 = -0.49%