-90.76% is the change from 866 to 80
Calculation steps:
[( 80 - 866 ) ÷ 866] x 100 = -90.76%
Formula
Percentage change = [(80 - 866) / 866] x 100
Subtract the new number by the original number
80 - 866 = -786
-786 ÷ 866 = -0.9076212471131639
-0.9076212471131639 x 100 = -90.76%