-22.63% is the change from 866 to 670
Calculation steps:
[( 670 - 866 ) ÷ 866] x 100 = -22.63%
Formula
Percentage change = [(670 - 866) / 866] x 100
Subtract the new number by the original number
670 - 866 = -196
-196 ÷ 866 = -0.22632794457274827
-0.22632794457274827 x 100 = -22.63%