-9.11% is the change from 911 to 828
Calculation steps:
[( 828 - 911 ) ÷ 911] x 100 = -9.11%
Formula
Percentage change = [(828 - 911) / 911] x 100
Subtract the new number by the original number
828 - 911 = -83
-83 ÷ 911 = -0.09110867178924259
-0.09110867178924259 x 100 = -9.11%