-22.86% is the change from 866 to 668
Calculation steps:
[( 668 - 866 ) ÷ 866] x 100 = -22.86%
Formula
Percentage change = [(668 - 866) / 866] x 100
Subtract the new number by the original number
668 - 866 = -198
-198 ÷ 866 = -0.22863741339491916
-0.22863741339491916 x 100 = -22.86%