-0.85% is the change from 823 to 816
Calculation steps:
[( 816 - 823 ) ÷ 823] x 100 = -0.85%
Formula
Percentage change = [(816 - 823) / 823] x 100
Subtract the new number by the original number
816 - 823 = -7
-7 ÷ 823 = -0.00850546780072904
-0.00850546780072904 x 100 = -0.85%