-10.78% is the change from 918 to 819
Calculation steps:
[( 819 - 918 ) ÷ 918] x 100 = -10.78%
Formula
Percentage change = [(819 - 918) / 918] x 100
Subtract the new number by the original number
819 - 918 = -99
-99 ÷ 918 = -0.10784313725490197
-0.10784313725490197 x 100 = -10.78%