-9.12% is the change from 866 to 787
Calculation steps:
[( 787 - 866 ) ÷ 866] x 100 = -9.12%
Formula
Percentage change = [(787 - 866) / 866] x 100
Subtract the new number by the original number
787 - 866 = -79
-79 ÷ 866 = -0.09122401847575058
-0.09122401847575058 x 100 = -9.12%