-20.77% is the change from 828 to 656
Calculation steps:
[( 656 - 828 ) ÷ 828] x 100 = -20.77%
Formula
Percentage change = [(656 - 828) / 828] x 100
Subtract the new number by the original number
656 - 828 = -172
-172 ÷ 828 = -0.20772946859903382
-0.20772946859903382 x 100 = -20.77%