-98.65% is the change from 815 to 11
Calculation steps:
[( 11 - 815 ) ÷ 815] x 100 = -98.65%
Formula
Percentage change = [(11 - 815) / 815] x 100
Subtract the new number by the original number
11 - 815 = -804
-804 ÷ 815 = -0.9865030674846625
-0.9865030674846625 x 100 = -98.65%