-20.81% is the change from 836 to 662
Calculation steps:
[( 662 - 836 ) ÷ 836] x 100 = -20.81%
Formula
Percentage change = [(662 - 836) / 836] x 100
Subtract the new number by the original number
662 - 836 = -174
-174 ÷ 836 = -0.20813397129186603
-0.20813397129186603 x 100 = -20.81%