-9.58% is the change from 866 to 783
Calculation steps:
[( 783 - 866 ) ÷ 866] x 100 = -9.58%
Formula
Percentage change = [(783 - 866) / 866] x 100
Subtract the new number by the original number
783 - 866 = -83
-83 ÷ 866 = -0.09584295612009237
-0.09584295612009237 x 100 = -9.58%