Log level form	t-statistic	Critical values			Conclusion
Variable	t-statistic	1%	5%	10%	Conclusion
LRGDP	1.506250	−2.627238	−1.949856	−1.611469	Non-stationary
LEXPTS	0.355873	−2.627238	−1.949856	−1.611469	Non-stationary
LIMPTS	0.577050	−2.627238	−1.949856	−1.611469	Non-stationary
LEXR	−4.419245	−4.252879	−3.548490	−3.207094	Stationary
1^st Difference form
LRGDP	−5.393067	−2.628961	−1.950117	−1.611339	stationary
LXPTS	−5.067308	−2.628961	−1.950117	−1.611339	stationary
LIMPTS	−5.668828	−2.628961	−1.950117	−1.611339	stationary
LEXR	−4.053072	−4.226815	−3.536601	−3.200320	stationary