-18.72% is the change from 828 to 673
Calculation steps:
[( 673 - 828 ) ÷ 828] x 100 = -18.72%
Formula
Percentage change = [(673 - 828) / 828] x 100
Subtract the new number by the original number
673 - 828 = -155
-155 ÷ 828 = -0.18719806763285024
-0.18719806763285024 x 100 = -18.72%