-84.18% is the change from 866 to 137
Calculation steps:
[( 137 - 866 ) ÷ 866] x 100 = -84.18%
Formula
Percentage change = [(137 - 866) / 866] x 100
Subtract the new number by the original number
137 - 866 = -729
-729 ÷ 866 = -0.8418013856812933
-0.8418013856812933 x 100 = -84.18%