-0.12% is the change from 816 to 815
Calculation steps:
[( 815 - 816 ) ÷ 816] x 100 = -0.12%
Formula
Percentage change = [(815 - 816) / 816] x 100
Subtract the new number by the original number
815 - 816 = -1
-1 ÷ 816 = -0.0012254901960784314
-0.0012254901960784314 x 100 = -0.12%