-98.66% is the change from 819 to 11
Calculation steps:
[( 11 - 819 ) ÷ 819] x 100 = -98.66%
Formula
Percentage change = [(11 - 819) / 819] x 100
Subtract the new number by the original number
11 - 819 = -808
-808 ÷ 819 = -0.9865689865689866
-0.9865689865689866 x 100 = -98.66%