-0.74% is the change from 815 to 809
Calculation steps:
[( 809 - 815 ) ÷ 815] x 100 = -0.74%
Formula
Percentage change = [(809 - 815) / 815] x 100
Subtract the new number by the original number
809 - 815 = -6
-6 ÷ 815 = -0.007361963190184049
-0.007361963190184049 x 100 = -0.74%