-98.5% is the change from 866 to 13
Calculation steps:
[( 13 - 866 ) ÷ 866] x 100 = -98.5%
Formula
Percentage change = [(13 - 866) / 866] x 100
Subtract the new number by the original number
13 - 866 = -853
-853 ÷ 866 = -0.9849884526558892
-0.9849884526558892 x 100 = -98.5%