| Variables | Augmented Dickey−Fuller | IO | |
| First Difference | |||
| No Trend | Trend | ||
| LNAG | −6.775719*** | −6.797043*** | I (1) |
| LNBM | −6.469992*** | −6.390611*** | I (1) |
| LNLIR | −6.123371*** | −6.136867*** | I (1) |
| LNGEA | −4.736726*** | −4.695988*** | I (1) |
| LNDCP | −6.499886*** | −6.451477*** | I (1) |