-99.56% is the change from 911 to 4
Calculation steps:
[( 4 - 911 ) ÷ 911] x 100 = -99.56%
Formula
Percentage change = [(4 - 911) / 911] x 100
Subtract the new number by the original number
4 - 911 = -907
-907 ÷ 911 = -0.995609220636663
-0.995609220636663 x 100 = -99.56%