-0.12% is the change from 811 to 810
Calculation steps:
[( 810 - 811 ) ÷ 811] x 100 = -0.12%
Formula
Percentage change = [(810 - 811) / 811] x 100
Subtract the new number by the original number
810 - 811 = -1
-1 ÷ 811 = -0.0012330456226880395
-0.0012330456226880395 x 100 = -0.12%