-81.06% is the change from 866 to 164
Calculation steps:
[( 164 - 866 ) ÷ 866] x 100 = -81.06%
Formula
Percentage change = [(164 - 866) / 866] x 100
Subtract the new number by the original number
164 - 866 = -702
-702 ÷ 866 = -0.8106235565819861
-0.8106235565819861 x 100 = -81.06%