-98.73% is the change from 866 to 11
Calculation steps:
[( 11 - 866 ) ÷ 866] x 100 = -98.73%
Formula
Percentage change = [(11 - 866) / 866] x 100
Subtract the new number by the original number
11 - 866 = -855
-855 ÷ 866 = -0.9872979214780601
-0.9872979214780601 x 100 = -98.73%