-10.81% is the change from 999 to 891
Calculation steps:
[( 891 - 999 ) ÷ 999] x 100 = -10.81%
Formula
Percentage change = [(891 - 999) / 999] x 100
Subtract the new number by the original number
891 - 999 = -108
-108 ÷ 999 = -0.10810810810810811
-0.10810810810810811 x 100 = -10.81%