The yield of natural gas from Norway's Troll gas field is expected to increase annually until the year 2005 and then to stabilize at six billion cubic feet a day, which will allow such an extraction rate at least for 50 years' production.

• A2005 and then to stabilize at six billion cubic feet a day, which will allow such an extraction rate at least for  
• B2005 and then to stabilize at six billion cubic feet a day, an extraction rate that will allow at least  
• C2005 and then stabilizing at six billion cubic feet a day, with such an extraction rate at the least allowing  
• D2005, then stabilizing at six billion cubic feet a day, allowing such an extraction rate for at least  
• E2005, then stabilizing at six billion cubic feet a day, which will allow such an extraction rate for at least