-1.23% is the change from 815 to 805
Calculation steps:
[( 805 - 815 ) ÷ 815] x 100 = -1.23%
Formula
Percentage change = [(805 - 815) / 815] x 100
Subtract the new number by the original number
805 - 815 = -10
-10 ÷ 815 = -0.012269938650306749
-0.012269938650306749 x 100 = -1.23%