-23.44% is the change from 866 to 663
Calculation steps:
[( 663 - 866 ) ÷ 866] x 100 = -23.44%
Formula
Percentage change = [(663 - 866) / 866] x 100
Subtract the new number by the original number
663 - 866 = -203
-203 ÷ 866 = -0.23441108545034642
-0.23441108545034642 x 100 = -23.44%