-4.5% is the change from 867 to 828
Calculation steps:
[( 828 - 867 ) ÷ 867] x 100 = -4.5%
Formula
Percentage change = [(828 - 867) / 867] x 100
Subtract the new number by the original number
828 - 867 = -39
-39 ÷ 867 = -0.04498269896193772
-0.04498269896193772 x 100 = -4.5%