a net importer of oil since 2005. As of 2010 the UK has around 3.1 billion barrels of proven crude oil reserves, the largest of any EU member state. In 2009 the UK was the 13th largest producer of natural gas in the world and the largest producer in the EU. Production is now in decline and the UK has been a net importer of natural gas since 2004. In 2009 the UK produced 19.7 million tons of coal and consumed 60.2 million tons. In 2005 it had proven recoverable coal reserves of 171 million tons. It has been estimated that identified onshore areas have the potential to produce between 7 billion tonnes and 16 billion tonnes of coal through underground coal gasification (UCG). Based on current UK coal consumption, these volumes represent reserves that could last the UK between 200 and 400 years. The UK is home to a number of large energy companies, including two of the six oil and gas "supermajors" – BP and Royal Dutch Shell. The UK is also rich in a number of natural resources including coal, tin, limestone, iron ore, salt, clay, chalk, gypsum, lead and silica. Service industries The service sector is the dominant sector of the UK economy, and it accounted for 79% of GDP in 2019. Creative industries The creative industries accounted for 7% of gross value added (GVA) in 2005 and grew at an average of 6% per annum between 1997 and 2005. Key areas include London and the North West of England, which are the two largest creative industry clusters in Europe. According to the British Fashion Council, the fashion industry's contribution to the UK economy in 2014 is £26 billion, up from £21 billion in 2009. The UK is home to the world's largest advertising company, WPP. Education, health and social work According to The Blue Book 2013 the education sector added a gross value of £84.6 billion in 2011 whilst human health and social work activities added £104.0 billion in 2011. In the UK the majority of the healthcare sector consists of the state funded and operated National Health Service (NHS), which accounts for over 80% of all healthcare spending in the UK and has a workforce of around 1.7 million, making it the largest employer in Europe, and putting it amongst the largest employers in the world. The NHS operates independently in each of the