Question: How many tonnes of coal did the UK produce in 2011?
About the article "United Kingdom", section "Energy".

Candidate passages:
An independent Queensland-based coal mining company with operations located in Queensland's Bowen Basin.
Macarthur Coal currently operates out of its Coppabella, Moorvale and Middlemount mines.
The company also has an extensive range of prospects for new projects.
Macarthur Coal mines approximately 5.5 million tonnes of raw coal to produce 4.2 million tonnes of product coal each year. 
In 2006, the UK was the world's ninth-largest consumer of energy and the 15th largest producer.
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 – and BG Group.
In 2011, 40% of the UK's electricity was produced by gas, 30% by coal, 19% by nuclear power and 4.2% by wind, hydro, biofuels and wastes.
In 2009, the UK produced 1.5 million barrels per day (bbl/d) of oil and consumed 1.7 million bbl/d.
Production is now in decline and the UK has been a net importer of oil since 2005. the UK had around 3.1 billion barrels of proven crude oil reserves, the largest of any EU member state.
In 2009, 66.5% of the UK's oil supply was imported.
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, half of British gas was supplied from imports and this is expected to increase to at least 75% by 2015, as domestic reserves are depleted.
Coal production played a key role in the UK economy in the 19th and 20th centuries.
In the mid-1970s, 130 million tonnes of coal was being produced annually, not falling below 100 million tonnes until the early 1980s.
During the 1980s and 1990s the industry was scaled back considerably.
In 2011, the UK produced 18.3 million tonnes of coal.
In 2005 it had proven recoverable coal reserves of 171 million tons.
The UK Coal Authority has stated there is a potential to produce between 7 billion tonnes and 16 billion tonnes of coal through underground coal gasification (UCG) or 'fraking', and that, based on current UK coal consumption, such reserves could last between 200 and 400 years.
However, environmental and social concerns have been raised over chemicals getting into the water table and minor earthquakes damaging homes.
In the late 1990s, nuclear power plants contributed around 25% of total annual electricity generation in the UK, but this has gradually declined as old plants have been shut down and ageing-related problems affect plant availability.
In 2012, the UK had 16 reactors normally generating about 19% of its electricity.
All but one of the reactors will be retired by 2023.
Unlike Germany and Japan, the UK intends to build a new generation of nuclear plants from about 2018.
The Blue Book 2013 reports that this sector added gross value of £31,380 million to the UK economy in 2011.
In 2007 the UK had a total energy output of 9.5 quadrillion Btus, of which the composition was oil (38%), natural gas (36%), coal (13%), nuclear (11%) and other renewables (2%).
In 2009, the UK produced 1.5 million barrels per day (bbl/d) of oil and consumed 1.7 million bbl/d.
Production is now in decline and the UK has been 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 – and BG Group. 
Uses today.
Coal as fuel.
Coal is primarily used as a solid fuel to produce electricity and heat through combustion.
World coal consumption was about 7.25 billion tonnes in 2010 (7.99 billion short tons) and is expected to increase 48% to 9.05 billion tonnes (9.98 billion short tons) by 2030.
China produced 3.47 billion tonnes (3.83 billion short tons) in 2011.
India produced about 578 million tonnes (637.1 million short tons) in 2011.
68.7% of China's electricity comes from coal.
The USA consumed about 13% of the world total in 2010, i.e.
951 million tonnes (1.05 billion short tons), using 93% of it for generation of electricity.
46% of total power generated in the USA was done using coal.
When coal is used for electricity generation, it is usually pulverized and then combusted (burned) in a furnace with a boiler.
The furnace heat converts boiler water to steam, which is then used to spin turbines which turn generators and create electricity.
The thermodynamic efficiency of this process has been improved over time.
Simple cycle steam turbines have topped out with some of the most advanced reaching about 35% thermodynamic efficiency for the entire process.
Increasing the combustion temperature can boost this efficiency even further.
Old coal power plants, especially "grandfathered" plants, are significantly less efficient and produce higher levels of waste heat.
At least 40% of the world's electricity comes from coal, and in 2012, about one-third of the United States' electricity came from coal, down from approximately 49% in 2008.
As of 2012 in the United States, use of coal to generate electricity was declining, as plentiful supplies of natural gas obtained by hydraulic fracturing of tight shale formations became available at low prices.
The emergence of the supercritical turbine concept envisions running a boiler at extremely high temperatures and pressures with projected efficiencies of 46%, with further theorized increases in temperature and pressure perhaps resulting in even higher efficiencies.
In Denmark, a net electric efficiency of > 47% has been obtained at the coal-fired Nordjyllandsværket CHP Plant and an overall plant efficiency of up to 91% with cogeneration of electricity and district heating.
The multifuel-fired Avedøreværket CHP Plant just outside Copenhagen can achieve a net electric efficiency as high as 49%.
The overall plant efficiency with cogeneration of electricity and district heating can reach as much as 94%.
An experimental way of coal combustion is in the form of coal-water slurry fuel (CWS), which was well-developed in Russia since the days of the Soviet Union.
CWS significantly reduces emissions, improving the heating value of coal.
Other ways to use coal are combined heat and power cogeneration and an MHD topping cycle.
The total known deposits recoverable by current technologies, including highly polluting, low-energy content types of coal (i.e., lignite, bituminous), is sufficient for many years.
However, consumption is increasing and maximal production could be reached within decades (see world coal reserves, below).
On the other hand much may have to be left in the ground to avoid climate change. 
In 2012 coal production in Ukraine amounted to 85.946 million tonnes, up 4.8% from 2011.
Coal consumption that same year grew by to 61.207 million tonnes, up 6.2% compared with 2011.
More than 90 percent of Ukraine’s coal production comes from the Donets Basin.
The country's coal industry employs about 500,000 people.
Ukrainian coal mines are among the most dangerous in the world, and accidents are common.
Furthermore, the country is plagued with extremely dangerous illegal mines.