-0.12% is the change from 815 to 814
Calculation steps:
[( 814 - 815 ) ÷ 815] x 100 = -0.12%
Formula
Percentage change = [(814 - 815) / 815] x 100
Subtract the new number by the original number
814 - 815 = -1
-1 ÷ 815 = -0.001226993865030675
-0.001226993865030675 x 100 = -0.12%