-0.12% is the change from 828 to 827
Calculation steps:
[( 827 - 828 ) ÷ 828] x 100 = -0.12%
Formula
Percentage change = [(827 - 828) / 828] x 100
Subtract the new number by the original number
827 - 828 = -1
-1 ÷ 828 = -0.0012077294685990338
-0.0012077294685990338 x 100 = -0.12%