| импорт | экспорт | импорт |
|---|
| 1950 | 236 | 204 | 262 | 227 | 1586 | 1371 |
| 1960 | 913 | 1004 | 1014 | 1116 | 4822 | 5302 |
| 1965 | 1347 | 1469 | 1497 | 1632 | 6640 | 7241 |
| 1970 | 2154 | 2540 | 2393 | 2822 | 8469 | 10251 |
| 1975 | 6140 | 9705 | 8535 | 13489 | 22459 | 35496 |
| 1976 | 7834 | 10824 | 10419 | 14396 | 25918 | 35811 |
| 1977 | 8817 | 9925 | 11815 | 13300 | 27637 | 31110 |
| 1978 | 8701 | 10979 | 12703 | 16029 | 27761 | 35029 |
| 1979 | 12506 | 13248 | 19009 | 20137 | 38364 | 40640 |
| 1980 | 15862 | 15721 | 24427 | 24210 | 45203 | 44801 |
| 1981 | 17247 | 18112 | 23973 |
