-0.73% is the change from 823 to 817
Calculation steps:
[( 817 - 823 ) ÷ 823] x 100 = -0.73%
Formula
Percentage change = [(817 - 823) / 823] x 100
Subtract the new number by the original number
817 - 823 = -6
-6 ÷ 823 = -0.007290400972053463
-0.007290400972053463 x 100 = -0.73%