-88.89% is the change from 891 to 99
Calculation steps:
[( 99 - 891 ) ÷ 891] x 100 = -88.89%
Formula
Percentage change = [(99 - 891) / 891] x 100
Subtract the new number by the original number
99 - 891 = -792
-792 ÷ 891 = -0.8888888888888888
-0.8888888888888888 x 100 = -88.89%