Question: When did the Thunder, from Oklahoma's largest city, become a team?

full_context: Document 1: Oklahoma City: Oklahoma City is the capital and largest city of the state of Oklahoma. The county seat of Oklahoma County, the city ranks 27th among United States cities in population. The population grew following the 2010 Census, with the population estimated to have increased to 620,602 as of July 2014. As of 2014, the Oklahoma City metropolitan area had a population of 1,322,429, and the Oklahoma City-Shawnee Combined Statistical Area had a population of 1,459,758 (Chamber of Commerce) residents, making it Oklahoma's largest metropolitan area. Oklahoma City's city limits extend into Canadian, Cleveland, and Pottawatomie counties, though much of those areas outside of the core Oklahoma County area are suburban or rural (watershed). The city ranks as the eighth-largest city in the United States by land area (including consolidated city-counties; it is the largest city in the United States by land area whose government is not consolidated with that of a county or borough).
Document 2: Oklahoma City: While not in Oklahoma City proper, other large employers within the MSA region include: Tinker Air Force Base (27,000); University of Oklahoma (11,900); University of Central Oklahoma (2,900); and Norman Regional Hospital (2,800).
Document 3: Oklahoma: In descending order of population, Oklahoma's largest cities in 2010 were: Oklahoma City (579,999, +14.6%), Tulsa (391,906, −0.3%), Norman (110,925, +15.9%), Broken Arrow (98,850, +32.0%), Lawton (96,867, +4.4%), Edmond (81,405, +19.2%), Moore (55,081, +33.9%), Midwest City (54,371, +0.5%), Enid (49,379, +5.0%), and Stillwater (45,688, +17.0%). Of the state's ten largest cities, three are outside the metropolitan areas of Oklahoma City and Tulsa, and only Lawton has a metropolitan statistical area of its own as designated by the United States Census Bureau, though the metropolitan statistical area of Fort Smith, Arkansas extends into the state.
Document 4: Oklahoma City: The Oklahoma City Thunder has been regarded by sports analysts as one of the elite franchises of the NBA's Western Conference and that of a media darling as the future of the league. Oklahoma City has earned Northwest Division titles every year since 2009 and has consistently improved its win record to 59-wins in 2014. The Thunder is led by first year head coach Billy Donovan and is anchored by several NBA superstars, including perennial All-Star point guard Russell Westbrook, 2014 MVP and four-time NBA scoring champion Kevin Durant, and Defensive Player of the Year nominee and shot-blocker Serge Ibaka.
Document 5: Oklahoma City: Oklahoma City has experienced significant population increases since the late 1990s. In May 2014, the U.S. Census announced Oklahoma City had an estimated population of 620,602 in 2014 and that it had grown 5.3 percent between April 2010 and June 2013. Since the official Census in 2000, Oklahoma City had grown 21 percent (a 114,470 raw increase) according to the Bureau estimates. The 2014 estimate of 620,602 is the largest population Oklahoma City has ever recorded. It is the first city in the state to record a population greater than 600,000 residents and the largest municipal population of the Great Plains region (OK, KS, NE, SD, ND).
Document 6: Oklahoma City Thunder: Oklahoma City Thunder 2018 -- 19 Oklahoma City Thunder season Conference Western Division Northwest Founded 1967 History Seattle SuperSonics 1967 -- 2008 Oklahoma City Thunder 2008 -- present Arena Chesapeake Energy Arena Location Oklahoma City, Oklahoma Team colors Thunder blue, sunset, yellow, navy blue General manager Sam Presti Head coach Billy Donovan Ownership Professional Basketball Club LLC (Clay Bennett, Chairman) Affiliation (s) Oklahoma City Blue Championships 1 (1979) Conference titles 4 (1978, 1979, 1996, 2012) Division titles 11 (1979, 1994, 1996, 1997, 1998, 2005, 2011, 2012, 2013, 2014, 2016) Retired numbers 7 (1, 10, 19, 24, 32, 43, Microphone) Website www.nba.com/thunder Uniforms Home Away
Document 7: Seattle SuperSonics relocation to Oklahoma City: The Seattle SuperSonics, a professional basketball team in the NBA, relocated from Seattle, Washington to Oklahoma City, Oklahoma in 2008. The third NBA franchise to relocate in the 2000s, the team began play as the Oklahoma City Thunder in the 2008 -- 09 basketball season.
Document 8: Oklahoma City Thunder: The team was originally established as the Seattle SuperSonics, an expansion team that joined the NBA for the 1967 -- 68 season. The SuperSonics moved in 2008 after a settlement was reached between the ownership group led by Clay Bennett and lawmakers in Seattle, Washington following a lawsuit. In Seattle, the SuperSonics qualified for the NBA playoffs 22 times, won their division six times, and won the 1979 NBA Championship. In Oklahoma City, the Thunder qualified for their first playoff berth during the 2009 -- 10 season. They won their first division title as the Thunder in the 2010 -- 11 season and their first Western Conference championship as the Thunder in the 2011 -- 12 season, appearing in the NBA Finals for the fourth time in franchise history and first since 1996, when the club was based in Seattle.
Document 9: Oklahoma City: Oklahoma City is the principal city of the eight-county Oklahoma City Metropolitan Statistical Area in Central Oklahoma and is the state's largest urbanized area. Based on population rank, the metropolitan area was the 42nd largest in the nation as of 2012.
Document 10: Cleveland Cavaliers: Cleveland Cavaliers 2018 -- 19 Cleveland Cavaliers season Conference Eastern Division Central Founded 1970 History Cleveland Cavaliers 1970 -- present Arena Quicken Loans Arena Location Cleveland, Ohio Team colors Wine, gold, navy blue, black Main sponsor Goodyear Tire and Rubber Company General manager Koby Altman Head coach Tyronn Lue Ownership Dan Gilbert (majority) Gordon Gund, Usher Raymond (minority) Affiliation (s) Canton Charge Championships 1 (2016) Conference titles 5 (2007, 2015, 2016, 2017, 2018) Division titles 7 (1976, 2009, 2010, 2015, 2016, 2017, 2018) Retired numbers 8 (7, 11, 22, 25, 34, 42, 43, MIC) Website www.nba.com/cavaliers Uniforms Home Away
Document 11: Broken Arrow, Oklahoma: Broken Arrow is a city located in the northeastern part of the U.S. state of Oklahoma, primarily in Tulsa County but also with a section of the city in western Wagoner County. It is the largest suburb of Tulsa. According to the 2010 census, Broken Arrow has a population of 98,850 residents and is the fourth-largest city in the state. However, a July 2017, estimate reports that the population of the city is just under 112,000, making it the 280th-largest city in the United States. The city is part of the Tulsa Metropolitan Area, which has a population of 961,561 residents.
Document 12: Oklahoma City: As of the 2010 census, there were 579,999 people, 230,233 households, and 144,120 families residing in the city. The population density was 956.4 inhabitants per square mile (321.9/km²). There were 256,930 housing units at an average density of 375.9 per square mile (145.1/km²).
Document 13: Oklahoma City: The Oklahoma City Thunder of the National Basketball Association (NBA) has called Oklahoma City home since the 2008–09 season, when owner Clayton Bennett relocated the franchise from Seattle, Washington. The Thunder plays home games at the Chesapeake Energy Arena in downtown Oklahoma City, known affectionately in the national media as 'the Peake' and 'Loud City'. The Thunder is known by several nicknames, including "OKC Thunder" and simply "OKC", and its mascot is Rumble the Bison.
Document 14: Cleveland Cavaliers: Cleveland Cavaliers 2018 -- 19 Cleveland Cavaliers season Conference Eastern Division Central Founded 1970 History Cleveland Cavaliers 1970 -- present Arena Quicken Loans Arena Location Cleveland, Ohio Team colors Wine, gold, navy blue, black Main sponsor Goodyear Tire and Rubber Company General manager Koby Altman Head coach Tyronn Lue Ownership Dan Gilbert (majority) Gordon Gund, Usher Raymond (minority) Affiliation (s) Canton Charge Championships 1 (2016) Conference titles 5 (2007, 2015, 2016, 2017, 2018) Division titles 7 (1976, 2009, 2010, 2015, 2016, 2017, 2018) Retired numbers 8 (7, 11, 22, 25, 34, 42, 43, Microphone) Website www.nba.com/cavaliers Uniforms Home Away
Document 15: Oklahoma: Oklahoma had 598 incorporated places in 2010, including four cities over 100,000 in population and 43 over 10,000. Two of the fifty largest cities in the United States are located in Oklahoma, Oklahoma City and Tulsa, and 65 percent of Oklahomans live within their metropolitan areas, or spheres of economic and social influence defined by the United States Census Bureau as a metropolitan statistical area. Oklahoma City, the state's capital and largest city, had the largest metropolitan area in the state in 2010, with 1,252,987 people, and the metropolitan area of Tulsa had 937,478 residents. Between 2000 and 2010, the cities that led the state in population growth were Blanchard (172.4%), Elgin (78.2%), Jenks (77.0%), Piedmont (56.7%), Bixby (56.6%), and Owasso (56.3%).
ground_truth: 1967
sub_queries: What is Oklahoma's largest city? Answer: Oklahoma City
when did the Oklahoma City thunder become a team Answer: 1967