-98.35% is the change from 911 to 15
Calculation steps:
[( 15 - 911 ) ÷ 911] x 100 = -98.35%
Formula
Percentage change = [(15 - 911) / 911] x 100
Subtract the new number by the original number
15 - 911 = -896
-896 ÷ 911 = -0.9835345773874863
-0.9835345773874863 x 100 = -98.35%