| 2711 |  | Petroleum gases and other gaseous hydrocarbons: |  |  |  |  | 
| 2711.11.00 | 00 | Liquefied: |  |  |  |  | 
| 2711.11.00 | 00 | Natural gas | thousand m3 | Free |  | Free | 
| 2711.12.00 |  | Propane |  | Free |  | Free | 
| 2711.12.00 | 10 | Propane with a minimum purity of 90 liquid volume percent | bbl |  |  |  | 
| 2711.12.00 | 20 | Other | bbl |  |  |  | 
| 2711.13.00 |  | Butanes |  | Free |  | Free | 
| 2711.13.00 | 10 | Butanes with a purity of 90 liquid volume percent or more, but less than 95 liquid volume percent | bbl |  |  |  | 
| 2711.13.00 | 20 | Other | bbl |  |  |  | 
| 2711.14.00 |  | Ethylene, propylene, butylene and butadiene |  | Free |  | Free | 
| 2711.14.00 | 10 | Ethylene | kg |  |  |  | 
| 2711.14.00 | 20 | Propylene | kg |  |  |  | 
| 2711.14.00 | 30 | Butylene | kg |  |  |  | 
| 2711.14.00 | 40 | Butadiene | kg |  |  |  | 
| 2711.19.00 |  | Other |  | Free |  | Free | 
| 2711.19.00 | 10 | Ethane | bbl |  |  |  | 
| 2711.19.00 | 20 | Other | kg liters |  |  |  | 
| 2711.21.00 | 00 | In gaseous state: |  |  |  |  | 
| 2711.21.00 | 00 | Natural gas | thousand m3 | Free |  | Free | 
| 2711.29.00 |  | Other |  | Free |  | Free | 
| 2711.29.00 | 10 | Propane: |  |  |  |  | 
| 2711.29.00 | 10 | Propane with a minimum purity of 90 liquid volume percent | bbl |  |  |  | 
| 2711.29.00 | 15 | Other | bbl |  |  |  | 
| 2711.29.00 | 20 | Butanes: |  |  |  |  | 
| 2711.29.00 | 20 | Butanes with a purity of 90 liquid volume percent or more, but less than 95 liquid volume percent | bbl |  |  |  |