-23.33% is the change from 866 to 664
Calculation steps:
[( 664 - 866 ) ÷ 866] x 100 = -23.33%
Formula
Percentage change = [(664 - 866) / 866] x 100
Subtract the new number by the original number
664 - 866 = -202
-202 ÷ 866 = -0.23325635103926096
-0.23325635103926096 x 100 = -23.33%