Question: Whe did sales of petrol by liters begin in the country owning RAF Brize Norton?

full_context: Document 1: Bermuda: The original NAS Bermuda on the west side of the island, a seaplane base until the mid-1960s, was designated as the Naval Air Station Bermuda Annex. It provided optional anchorage and/or dockage facilities for transiting US Navy, US Coast Guard and NATO vessels, depending on size. An additional US Navy compound known as Naval Facility Bermuda (NAVFAC Bermuda), a SOSUS station, was located to the west of the Annex near a Canadian Forces communications facility. Although leased for 99 years, US forces withdrew in 1995, as part of the wave of base closures following the end of the Cold War.
Document 2: Metrication in the United Kingdom: Another example was the Met Office who, in 1962, started publishing temperatures in both Celsius and Fahrenheit, dropping the use of Fahrenheit from their official reports in 1970.
Document 3: Metrication in Canada: The Liberal federal government of Pierre Trudeau first began implementing metrication in Canada in 1970 with a government agency dedicated to implementing the project, the Metric Commission, being established in 1971. By the mid-1970s, metric product labelling was introduced. In 1972, the provinces agreed to make all road signs metric by 1977. There was some resistance to metrication, especially as the sectors of the economy where the federal Weights and Measures Act required metric to be used grew in number. The metrication of gasoline and diesel fuel sales in 1979 prompted 37 Progressive Conservative Members of Parliament to open a ``freedom to measure ''gas station in Carleton Place, Ontario, selling gas in both imperial gallons and litres. The city of Peterborough, Ontario, was a noted hotbed of opposition to metrication, having been one of the government's three test centres for the metrication process. Bill Domm, a Member of Parliament representing the riding of Peterborough, was one of the country's most outspoken opponents of metrication. During this period, a few government employees lost their jobs for their opposition to metrication. Neil Fraser, an official with Revenue Canada who publicly opposed mandatory metric conversion, was dismissed for`` conduct unacceptable for a public servant.''
Document 4: Airport: Most of the world's airports are owned by local, regional, or national government bodies who then lease the airport to private corporations who oversee the airport's operation. For example, in the United Kingdom the state-owned British Airports Authority originally operated eight of the nation's major commercial airports - it was subsequently privatized in the late 1980s, and following its takeover by the Spanish Ferrovial consortium in 2006, has been further divested and downsized to operating just five. Germany's Frankfurt Airport is managed by the quasi-private firm Fraport. While in India GMR Group operates, through joint ventures, Indira Gandhi International Airport and Rajiv Gandhi International Airport. Bengaluru International Airport and Chhatrapati Shivaji International Airport are controlled by GVK Group. The rest of India's airports are managed by the Airports Authority of India.
Document 5: Canadian Armed Forces: Major air bases are located in British Columbia, Alberta, Saskatchewan, Manitoba, Ontario, Quebec, Nova Scotia, and Newfoundland and Labrador, while administrative and command and control facilities are located in Winnipeg and North Bay. A Canadian component of the NATO Airborne Early Warning Force is also based at NATO Air Base Geilenkirchen near Geilenkirchen, Germany.
Document 6: Metrication in the United Kingdom: Metrication in the United Kingdom, the process of introducing the metric system of measurement in place of imperial units, has made steady progress since the mid -- 20th century but today remains equivocal and varies by context. Most of government, industry and commerce use metric units, but imperial units are officially used to specify journey distances, vehicle speeds and the sizes of returnable milk containers, beer and cider glasses (though fresh milk is often still sold in multiples of pints, with the metric equivalent also marked). Imperial units are also often used to describe body measurements and vehicle fuel economy. In schools metric units are taught and used as the norm and imperial units that remain in common usage in the UK must also be taught.
Document 7: Metrication in Australia: Metrication in Australia effectively began in 1966 with the conversion to decimal currency under the auspices of the Decimal Currency Board. The conversion of measurements -- metrication -- commenced subsequently in 1971, under the direction of the Metric Conversion Board and actively proceeded until the Board was disbanded in 1981.
Document 8: Metrication in the United Kingdom: 1970 Electric Cable Makers Confederation, British Aerospace Companies Limited drawing and documentation, London Metal Exchange, flat glass 1971 Paper and board, National Coal Board designs, pharmaceuticals 1972 Paint industry, steel industry, building regulations 1974 Textile and wool transactions, leading clothing manufacturers adopt dual units 1975 Retail trade in fabrics and floor coverings, post office tariffs, medical practice 1976 Bulk sales of petroleum, agriculture and horticulture 1977 Livestock auctions 1978 Solid fuel retailing, cheese wholesaling, bread, London Commodity Market
Document 9: Oklahoma City: Oklahoma City is served by two primary airports, Will Rogers World Airport and the much smaller Wiley Post Airport (incidentally, the two honorees died in the same plane crash in Alaska) Will Rogers World Airport is the state's busiest commercial airport, with over 3.6 million passengers annually. Tinker Air Force Base, in southeast Oklahoma City, is the largest military air depot in the nation; a major maintenance and deployment facility for the Navy and the Air Force, and the second largest military institution in the state (after Fort Sill in Lawton).
Document 10: Airport: Many large airports are located near railway trunk routes for seamless connection of multimodal transport, for instance Frankfurt Airport, Amsterdam Airport Schiphol, London Heathrow Airport, London Gatwick Airport and London Stansted Airport. It is also common to connect an airport and a city with rapid transit, light rail lines or other non-road public transport systems. Some examples of this would include the AirTrain JFK at John F. Kennedy International Airport in New York, Link Light Rail that runs from the heart of downtown Seattle to Seattle–Tacoma International Airport, and the Silver Line T at Boston's Logan International Airport by the Massachusetts Bay Transportation Authority (MBTA). Such a connection lowers risk of missed flights due to traffic congestion. Large airports usually have access also through controlled-access highways ('freeways' or 'motorways') from which motor vehicles enter either the departure loop or the arrival loop.
Document 11: Airport: The majority of the world's airports are non-towered, with no air traffic control presence. However, at particularly busy airports, or airports with other special requirements, there is an air traffic control (ATC) system whereby controllers (usually ground-based) direct aircraft movements via radio or other communications links. This coordinated oversight facilitates safety and speed in complex operations where traffic moves in all three dimensions. Air traffic control responsibilities at airports are usually divided into at least two main areas: ground and tower, though a single controller may work both stations. The busiest airports also have clearance delivery, apron control, and other specialized ATC stations.
Document 12: Metrication in Canada: Metrication in Canada began in 1970 and while Canada has converted to the metric system for many purposes, there is still significant use of non-metric units and standards in many sectors of the Canadian economy. This is mainly due to historical ties with the United Kingdom (before metrication), the traditional use of the imperial system of measurement in Canada, proximity to the United States, and to public opposition to metrication during the transition period.
Document 13: Airport: An airbase, sometimes referred to as an air station or airfield, provides basing and support of military aircraft. Some airbases, known as military airports, provide facilities similar to their civilian counterparts. For example, RAF Brize Norton in the UK has a terminal which caters to passengers for the Royal Air Force's scheduled TriStar flights to the Falkland Islands. Some airbases are co-located with civilian airports, sharing the same ATC facilities, runways, taxiways and emergency services, but with separate terminals, parking areas and hangars. Bardufoss Airport , Bardufoss Air Station in Norway and Pune Airport in India are examples of this.
Document 14: Pound (mass): In the UK, the process of metrication and European units of measurement directives were expected to eliminate the use of the pound and ounce, but in 2007 the European Commission abandoned the requirement for metric - only labelling on packaged goods there, and allowed for dual metric -- imperial marking to continue indefinitely. When used as a measurement of body weight the UK practice remains to use the stone of 14 pounds as the primary measure e.g. ``11 stone 4 pounds '', rather than`` 158 pounds'' (as done in the US), or ``72 kilograms ''as used elsewhere.
Document 15: Saint Helena: Saint Helena is one of the most remote islands in the world, has one commercial airport under construction, and travel to the island is by ship only. A large military airfield is located on Ascension Island, with two Friday flights to RAF Brize Norton, England (as from September 2010). These RAF flights offer a limited number of seats to civilians.
ground_truth: 1976
sub_queries: Where is RAF Brize Norton located? Answer: the UK
when did the UK start selling petrol in litres Answer: 1976