-8.78% is the change from 866 to 790
Calculation steps:
[( 790 - 866 ) ÷ 866] x 100 = -8.78%
Formula
Percentage change = [(790 - 866) / 866] x 100
Subtract the new number by the original number
790 - 866 = -76
-76 ÷ 866 = -0.08775981524249422
-0.08775981524249422 x 100 = -8.78%