-2.39% is the change from 836 to 816
Calculation steps:
[( 816 - 836 ) ÷ 836] x 100 = -2.39%
Formula
Percentage change = [(816 - 836) / 836] x 100
Subtract the new number by the original number
816 - 836 = -20
-20 ÷ 836 = -0.023923444976076555
-0.023923444976076555 x 100 = -2.39%