Oil and gas each supply over a quarter of Turkey's primary energy. The country consumes 50 to 60 billion cubic metres of natural gas each year. Almost all oil and gas is imported and is a big part of the current account deficit of the economy, but a large gas field in the Black Sea is expected to start production in 2023. Over half of the imported oil and oil products are used for road transport. Turkey is the world's largest user of liquefied petroleum gas for road transport. Turkey is almost completely dependent on imports of oil, as only 7% of oil is produced locally.