-21.02% is the change from 866 to 684
Calculation steps:
[( 684 - 866 ) ÷ 866] x 100 = -21.02%
Formula
Percentage change = [(684 - 866) / 866] x 100
Subtract the new number by the original number
684 - 866 = -182
-182 ÷ 866 = -0.21016166281755197
-0.21016166281755197 x 100 = -21.02%