-0.12% is the change from 829 to 828
Calculation steps:
[( 828 - 829 ) ÷ 829] x 100 = -0.12%
Formula
Percentage change = [(828 - 829) / 829] x 100
Subtract the new number by the original number
828 - 829 = -1
-1 ÷ 829 = -0.0012062726176115801
-0.0012062726176115801 x 100 = -0.12%