-18.23% is the change from 823 to 673
Calculation steps:
[( 673 - 823 ) ÷ 823] x 100 = -18.23%
Formula
Percentage change = [(673 - 823) / 823] x 100
Subtract the new number by the original number
673 - 823 = -150
-150 ÷ 823 = -0.1822600243013366
-0.1822600243013366 x 100 = -18.23%