-9% is the change from 911 to 829
Calculation steps:
[( 829 - 911 ) ÷ 911] x 100 = -9%
Formula
Percentage change = [(829 - 911) / 911] x 100
Subtract the new number by the original number
829 - 911 = -82
-82 ÷ 911 = -0.09001097694840834
-0.09001097694840834 x 100 = -9%