-86.03% is the change from 866 to 121
Calculation steps:
[( 121 - 866 ) ÷ 866] x 100 = -86.03%
Formula
Percentage change = [(121 - 866) / 866] x 100
Subtract the new number by the original number
121 - 866 = -745
-745 ÷ 866 = -0.8602771362586605
-0.8602771362586605 x 100 = -86.03%