| Variables | Names |
| Y | Import volume index |
| X1 | Foreign direct investment, net inflows (% of GDP) |
| X2 | Gross capital formation (% of GDP) |
| X3 | Official exchange rate (LCU per US$, period average) |
| X4 | Trade openness |
| X5 | External debt stocks (% of exports of goods, services and primary income) |
| X6 | Final consumption expenditure (% of GDP) |
| X7 | Relative import prices |
| X8 | GDP growth (annual %) |
| X9 | Inflation GDP deflator (annual %) |
| X10 | Population growth (annual %) |
| X11 | Savings [Total reserves (% of total external debt)] |