-9.24% is the change from 866 to 786
Calculation steps:
[( 786 - 866 ) ÷ 866] x 100 = -9.24%
Formula
Percentage change = [(786 - 866) / 866] x 100
Subtract the new number by the original number
786 - 866 = -80
-80 ÷ 866 = -0.09237875288683603
-0.09237875288683603 x 100 = -9.24%