-15.94% is the change from 866 to 728
Calculation steps:
[( 728 - 866 ) ÷ 866] x 100 = -15.94%
Formula
Percentage change = [(728 - 866) / 866] x 100
Subtract the new number by the original number
728 - 866 = -138
-138 ÷ 866 = -0.15935334872979215
-0.15935334872979215 x 100 = -15.94%