0.12% is the change from 815 to 816
Calculation steps:
[( 816 - 815 ) ÷ 815] x 100 = 0.12%
Formula
Percentage change = [(816 - 815) / 815] x 100
Subtract the new number by the original number
816 - 815 = 1
1 ÷ 815 = 0.001226993865030675
0.001226993865030675 x 100 = 0.12%