-98.66% is the change from 823 to 11
Calculation steps:
[( 11 - 823 ) ÷ 823] x 100 = -98.66%
Formula
Percentage change = [(11 - 823) / 823] x 100
Subtract the new number by the original number
11 - 823 = -812
-812 ÷ 823 = -0.9866342648845686
-0.9866342648845686 x 100 = -98.66%