-2.15% is the change from 836 to 818
Calculation steps:
[( 818 - 836 ) ÷ 836] x 100 = -2.15%
Formula
Percentage change = [(818 - 836) / 836] x 100
Subtract the new number by the original number
818 - 836 = -18
-18 ÷ 836 = -0.0215311004784689
-0.0215311004784689 x 100 = -2.15%