-8.33% is the change from 108 to 99
Calculation steps:
[( 99 - 108 ) ÷ 108] x 100 = -8.33%
Formula
Percentage change = [(99 - 108) / 108] x 100
Subtract the new number by the original number
99 - 108 = -9
-9 ÷ 108 = -0.08333333333333333
-0.08333333333333333 x 100 = -8.33%