-9.8% is the change from 918 to 828
Calculation steps:
[( 828 - 918 ) ÷ 918] x 100 = -9.8%
Formula
Percentage change = [(828 - 918) / 918] x 100
Subtract the new number by the original number
828 - 918 = -90
-90 ÷ 918 = -0.09803921568627451
-0.09803921568627451 x 100 = -9.8%