According to Oil and Gas Journal (OGJ), the UK had 4.0 billion barrels of proven Crude Oil reserves in 2006, the most of any EU member country. The UK consumed 1.8 million barrels per day (bbl/d) of oil in 2005, mostly flat from the previous year. The importance of oil to the UK economy has declined slightly over the past two decades, with oils contribution to total energy consumption falling from in 37 percent in 1983 to 35 percent in 2003. The UK Continental Shelf (UKCS), located in the North Sea off the eastern coast of the UK, contains the bulk of the countrys oil reserves. There are also sizable reserves in the North Sea north of the Shetland Islands, with smaller amounts in the North Atlantic. Besides these offshore assets, the UK also has the Wytch Farm field, the largest onshore oil field in Europe.