-87.41% is the change from 866 to 109
Calculation steps:
[( 109 - 866 ) ÷ 866] x 100 = -87.41%
Formula
Percentage change = [(109 - 866) / 866] x 100
Subtract the new number by the original number
109 - 866 = -757
-757 ÷ 866 = -0.874133949191686
-0.874133949191686 x 100 = -87.41%