Eurofighter and assembles the aircraft for the Royal Air Force, the plane was based on the British Aerospace EAP design which first flew in 1986. BAE Systems is also a principal subcontractor on the F35 Joint Strike Fighter – the world's largest single defence project – for which it designs and manufactures a range of components. It also manufactures the Hawk, the world's most successful jet training aircraft. Airbus UK also manufactures the wings for the A400M military transporter. Rolls-Royce is the world's second-largest aero-engine manufacturer. Its engines power more than 30 types of commercial aircraft and it has more than 30,000 engines in service in the civil and defence sectors. The UK space industry was worth £16.5bn in 2019/20 and employed 47,000 people. Since 2012, the number of space organisations has grown on average nearly 21% per year, with 1,293 organisations reported in 2021. In 2013, the British Government pledged £60 m to the Skylon project: this investment will provide support at a "crucial stage" to allow a full-scale prototype of the SABRE engine to be built. The pharmaceutical industry plays an important role in the UK economy and the country has the third-highest share of global pharmaceutical R&D expenditures. Agriculture is intensive, highly mechanised and efficient by European standards, producing about 60 per cent of food needs with less than 1.6 per cent of the labour force (535,000 workers). Around two-thirds of production is devoted to livestock, one-third to arable crops. The UK retains a significant, though much reduced fishing industry. It is also rich in a variety of natural resources including coal, petroleum, natural gas, tin, limestone, iron ore, salt, clay, chalk, gypsum, lead, silica and an abundance of arable land. In 2020, coronavirus lockdown measures caused the UK economy to suffer its biggest slump on record, shrinking by 20.4 per cent between April and June compared to the first three months of the year, to push it officially into recession for the first time in 11 years. The UK Government debt was £2,436.7 billion at the end of Quarter 2 (Apr to June) 2022. The UK has the 2nd best debt-to-GDP ratio out of the G7 countries. The UK annual GDP output is estimated to have grown by 4.1% in 2022. Science and technology England and Scotland were leading centres of the Scientific Revolution from the 17th century. The United Kingdom led the Industrial Revolution from