-29.56% is the change from 866 to 610
Calculation steps:
[( 610 - 866 ) ÷ 866] x 100 = -29.56%
Formula
Percentage change = [(610 - 866) / 866] x 100
Subtract the new number by the original number
610 - 866 = -256
-256 ÷ 866 = -0.2956120092378753
-0.2956120092378753 x 100 = -29.56%