Null Hypothesis: CI has a unit root

Exogenous: Constant

Lag Length: 0 (Automatic—based on SIC, max lag = 9)

t-Statistic

Prob.*

Augmented Dickey-Fuller test statistic

−4.702396

0.0006

Test critical values:

1% level

−3.632900

5% level

−2.948404

10% level

−2.612874