-11.2% is the change from 911 to 809
Calculation steps:
[( 809 - 911 ) ÷ 911] x 100 = -11.2%
Formula
Percentage change = [(809 - 911) / 911] x 100
Subtract the new number by the original number
809 - 911 = -102
-102 ÷ 911 = -0.1119648737650933
-0.1119648737650933 x 100 = -11.2%