-0.37% is the change from 818 to 815
Calculation steps:
[( 815 - 818 ) ÷ 818] x 100 = -0.37%
Formula
Percentage change = [(815 - 818) / 818] x 100
Subtract the new number by the original number
815 - 818 = -3
-3 ÷ 818 = -0.003667481662591687
-0.003667481662591687 x 100 = -0.37%