One of the most popularly traded commodities is Brent crude oil, which comes from a North Sea field. Starting in 2002, declining Brent production necessitated Brent transactions also including Forties from the UK and Oseberg from Norway. In 2007, Norwegian Ekofisk was added, and in 2018 Norway’s Troll will be added. As for Brent, activity there will soon end more than 40 years after the field began producing in 1976.