-18.96% is the change from 828 to 671
Calculation steps:
[( 671 - 828 ) ÷ 828] x 100 = -18.96%
Formula
Percentage change = [(671 - 828) / 828] x 100
Subtract the new number by the original number
671 - 828 = -157
-157 ÷ 828 = -0.18961352657004832
-0.18961352657004832 x 100 = -18.96%