-84.3% is the change from 866 to 136
Calculation steps:
[( 136 - 866 ) ÷ 866] x 100 = -84.3%
Formula
Percentage change = [(136 - 866) / 866] x 100
Subtract the new number by the original number
136 - 866 = -730
-730 ÷ 866 = -0.8429561200923787
-0.8429561200923787 x 100 = -84.3%