-2.39% is the change from 838 to 818
Calculation steps:
[( 818 - 838 ) ÷ 838] x 100 = -2.39%
Formula
Percentage change = [(818 - 838) / 838] x 100
Subtract the new number by the original number
818 - 838 = -20
-20 ÷ 838 = -0.02386634844868735
-0.02386634844868735 x 100 = -2.39%