-8.91% is the change from 999 to 910
Calculation steps:
[( 910 - 999 ) ÷ 999] x 100 = -8.91%
Formula
Percentage change = [(910 - 999) / 999] x 100
Subtract the new number by the original number
910 - 999 = -89
-89 ÷ 999 = -0.0890890890890891
-0.0890890890890891 x 100 = -8.91%