-8.07% is the change from 991 to 911
Calculation steps:
[( 911 - 991 ) ÷ 991] x 100 = -8.07%
Formula
Percentage change = [(911 - 991) / 991] x 100
Subtract the new number by the original number
911 - 991 = -80
-80 ÷ 991 = -0.08072653884964683
-0.08072653884964683 x 100 = -8.07%