-4.04% is the change from 866 to 831
Calculation steps:
[( 831 - 866 ) ÷ 866] x 100 = -4.04%
Formula
Percentage change = [(831 - 866) / 866] x 100
Subtract the new number by the original number
831 - 866 = -35
-35 ÷ 866 = -0.04041570438799076
-0.04041570438799076 x 100 = -4.04%