-81.76% is the change from 866 to 158
Calculation steps:
[( 158 - 866 ) ÷ 866] x 100 = -81.76%
Formula
Percentage change = [(158 - 866) / 866] x 100
Subtract the new number by the original number
158 - 866 = -708
-708 ÷ 866 = -0.8175519630484989
-0.8175519630484989 x 100 = -81.76%