Table 3.

Unit root test and difference results based on Eviews 7.2

Sequence	ADF Statistic	Critical Value			Value of p
		1%	5%	10%
Q	−7.894837	−4.156734	−3.504330	−3.181826	0.0000
Q*	−13.37168	−4.161144	−3.506374	−3.183002	0.0000
Q**	−7.008416	−4.165756	−3.508508	−3.184230	0.0000