-6.93% is the change from 823 to 766
Calculation steps:
[( 766 - 823 ) ÷ 823] x 100 = -6.93%
Formula
Percentage change = [(766 - 823) / 823] x 100
Subtract the new number by the original number
766 - 823 = -57
-57 ÷ 823 = -0.0692588092345079
-0.0692588092345079 x 100 = -6.93%