Question: What year was the formation of the league whose trophy Arsenal won in the 2003-2004 season without losing a match?

full_context: Document 1: Arsène Wenger: Arsène Charles Ernest Wenger  (French pronunciation: ​[aʁsɛn vɛŋɡɛʁ]; born 22 October 1949) is a French football manager and former player. He was the manager of Arsenal from 1996 to 2018, where he was the longest-serving and most successful in the club's history. His contribution to English football through changes to scouting, players' training and diet regimens revitalised Arsenal and aided the globalisation of the sport in the 21st century.
Document 2: Arsenal F.C.: Arsenal's tally of 13 League Championships is the third highest in English football, after Manchester United (20) and Liverpool (18), and they were the first club to reach a seventh and an eighth League Championship. As of May 2016, they are one of only six teams, the others being Manchester United, Blackburn Rovers, Chelsea, Manchester City and Leicester City, to have won the Premier League since its formation in 1992.
Document 3: Arsenal F.C.: Arsenal Football Club is a professional football club based in Islington, London, England, that plays in the Premier League, the top flight of English football. The club has won 13 League titles, a record 13 FA Cups, two League Cups, the League Centenary Trophy, 15 FA Community Shields, one UEFA Cup Winners' Cup and one Inter-Cities Fairs Cup. It is also the only English club to go a 38 - match league season unbeaten, receiving the nickname The Invincibles, and a special gold Premier League trophy.
Document 4: Arsenal F.C.: Arsenal finished in either first or second place in the league in eight of Wenger's first eleven seasons at the club, although on no occasion were they able to retain the title. As of July 2013, they were one of only five teams, the others being Manchester United, Blackburn Rovers, Chelsea, and Manchester City, to have won the Premier League since its formation in 1992. Arsenal had never progressed beyond the quarter-finals of the Champions League until 2005–06; in that season they became the first club from London in the competition's fifty-year history to reach the final, in which they were beaten 2–1 by Barcelona. In July 2006, they moved into the Emirates Stadium, after 93 years at Highbury.
Document 5: Arsenal F.C.: Arsenal Football Club is a professional football club based in Highbury, London, England, that plays in the Premier League, the top flight of English football. The club has won 13 League titles, a record 13 FA Cups, two League Cups, the League Centenary Trophy, 15 FA Community Shields, one UEFA Cup Winners' Cup and one Inter-Cities Fairs Cup. It has won the second-most top flight matches in English football history, and is the only English club to go a 38 - match league season unbeaten.
Document 6: Premier League Manager of the Season: Season Manager Nationality Club Ref 1993 -- 94 Ferguson, Alex Alex Ferguson Scotland Manchester United 1994 -- 95 Dalglish, Kenny Kenny Dalglish Scotland Blackburn Rovers 1995 -- 96 Ferguson, Alex Alex Ferguson (2) Scotland Manchester United 1996 -- 97 Ferguson, Alex Alex Ferguson (3) Scotland Manchester United 1997 -- 98 Wenger, Arsene Arsène Wenger France Arsenal 1998 -- 99 Ferguson, Alex Alex Ferguson (4) Scotland Manchester United 1999 -- 2000 Ferguson, Alex Alex Ferguson (5) Scotland Manchester United 2000 -- 01 Burley, George George Burley Scotland Ipswich Town 2001 -- 02 Wenger, Arsene Arsène Wenger (2) France Arsenal 2002 -- 03 Ferguson, Alex Alex Ferguson (6) Scotland Manchester United 2003 -- 04 Wenger, Arsene Arsène Wenger (3) France Arsenal 2004 -- 05 Mourinho, Jose José Mourinho Portugal Chelsea 2005 -- 06 Mourinho, Jose José Mourinho (2) Portugal Chelsea 2006 -- 07 Ferguson, Alex Alex Ferguson (7) Scotland Manchester United 2007 -- 08 Ferguson, Alex Alex Ferguson (8) Scotland Manchester United 2008 -- 09 Ferguson, Alex Alex Ferguson (9) Scotland Manchester United 2009 -- 10 Redknapp, Harry Harry Redknapp England Tottenham Hotspur 2010 -- 11 Ferguson, Alex Alex Ferguson (10) Scotland Manchester United 2011 -- 12 Pardew, Alan Alan Pardew England Newcastle United 2012 -- 13 Ferguson, Alex Alex Ferguson (11) Scotland Manchester United 2013 -- 14 Pulis, Tony Tony Pulis Wales Crystal Palace 2014 -- 15 Mourinho, Jose José Mourinho (3) Portugal Chelsea 2015 -- 16 Ranieri, Claudio Claudio Ranieri Italy Leicester City 2016 -- 17 Conte, Antonio Antonio Conte Italy Chelsea 2017 -- 18 Guardiola, Pep Pep Guardiola Spain Manchester City
Document 7: Arsenal F.C.: The return of former player George Graham as manager in 1986 brought a third period of glory. Arsenal won the League Cup in 1987, Graham's first season in charge. This was followed by a League title win in 1988–89, won with a last-minute goal in the final game of the season against fellow title challengers Liverpool. Graham's Arsenal won another title in 1990–91, losing only one match, won the FA Cup and League Cup double in 1993, and a second European trophy, the European Cup Winners' Cup, in 1994. Graham's reputation was tarnished when he was found to have taken kickbacks from agent Rune Hauge for signing certain players, and he was dismissed in 1995. His replacement, Bruce Rioch, lasted for only one season, leaving the club after a dispute with the board of directors.
Document 8: Arsenal F.C.: They hold the highest number of FA Cup trophies, with 13. The club is one of only six clubs to have won the FA Cup twice in succession, in 2002 and 2003, and 2014 and 2015. Arsenal have achieved three League and FA Cup ``Doubles ''(in 1971, 1998 and 2002), a feat only previously achieved by Manchester United (in 1994, 1996 and 1999). They were the first side in English football to complete the FA Cup and League Cup double, in 1993. Arsenal were also the first London club to reach the final of the UEFA Champions League, in 2006, losing the final 2 -- 1 to Barcelona.
Document 9: Arsenal F.C.: Arsenal was the first club from the south of England to join The Football League, in 1893. They entered the First Division in 1904, and have since accumulated the second most points. Relegated only once, in 1913, they continue the longest streak in the top division. In the 1930s, Arsenal won five League Championships and two FA Cups, and another FA Cup and two Championships after the war. In 1970–71, they won their first League and FA Cup Double. Between 1988 and 2005, they won five League titles and five FA Cups, including two more Doubles. They completed the 20th century with the highest average league position.
Document 10: History of Arsenal F.C. (1966–present): The 2016 / 17 season was one of Arsenal's most testing for competitions in Europe, having taken a race with Liverpool and Manchester City to the final day of the season. Despite winning 3 - 1 against Everton, results elsewhere meant they only finished fifth, missing out on a Champions League spot for the first time in two decades. However Arsenal won the FA Cup Final 2 - 1 against Chelsea. This was their third win in four seasons and made them the most successful club in the history of the competition.
Document 11: Arsenal F.C.: Arsenal appointed Herbert Chapman as manager in 1925. Having already won the league twice with Huddersfield Town in 1923–24 and 1924–25 (see Seasons in English football), Chapman brought Arsenal their first period of major success. His revolutionary tactics and training, along with the signings of star players such as Alex James and Cliff Bastin, laid the foundations of the club's domination of English football in the 1930s. Under his guidance Arsenal won their first major trophies – victory in the 1930 FA Cup Final preceded two League Championships, in 1930–31 and 1932–33. In addition, Chapman was behind the 1932 renaming of the local London Underground station from "Gillespie Road" to "Arsenal", making it the only Tube station to be named specifically after a football club.
Document 12: Arsenal F.C.: Arsenal Football Club is a professional football club based in Highbury, London, England, that plays in the Premier League, the top flight of English football. The club has won 13 League titles, a record 13 FA Cups, two League Cups, the League Centenary Trophy, 15 FA Community Shields, one UEFA Cup Winners' Cup and one Inter-Cities Fairs Cup. It has won more top flight matches than any English club except Liverpool, and has completed the only 38 match season unbeaten.
Document 13: Arsenal F.C.: Arsenal's tally of 13 League Championships is the third highest in English football, after Manchester United (20) and Liverpool (18), and they were the first club to reach 8 League Championships. They hold the highest number of FA Cup trophies, 12. The club is one of only six clubs to have won the FA Cup twice in succession, in 2002 and 2003, and 2014 and 2015. Arsenal have achieved three League and FA Cup "Doubles" (in 1971, 1998 and 2002), a feat only previously achieved by Manchester United (in 1994, 1996 and 1999). They were the first side in English football to complete the FA Cup and League Cup double, in 1993. Arsenal were also the first London club to reach the final of the UEFA Champions League, in 2006, losing the final 2–1 to Barcelona.
Document 14: Arsenal F.C.: The club's success in the late 1990s and first decade of the 21st century owed a great deal to the 1996 appointment of Arsène Wenger as manager. Wenger brought new tactics, a new training regime and several foreign players who complemented the existing English talent. Arsenal won a second League and Cup double in 1997–98 and a third in 2001–02. In addition, the club reached the final of the 1999–2000 UEFA Cup (losing on penalties to Galatasaray), were victorious in the 2003 and 2005 FA Cups, and won the Premier League in 2003–04 without losing a single match, an achievement which earned the side the nickname "The Invincibles". The feat came within a run of 49 league matches unbeaten from 7 May 2003 to 24 October 2004, a national record.
Document 15: History of Arsenal F.C. (1966–present): For the following season, Arsenal gradually progressed upon their league form, eventually becoming runners - up in 2016. In order to capture that ever - elusive Premier League title for the first time in 12 years, the club spent heavily in the transfer market in the summer of 2016, spending over £80 million on four first - team acquisitions, namely capturing Shkodran Mustafi and Granit Xhaka, who operate as a central defender and central midfielder, respectively. Both positions were long deemed problem positions in the team, with the hope Arsenal could push on and win the league after signing the pair. However, poor league form saw Arsenal competing heavily for the final UEFA Champions League space, having taken a race with Liverpool and Manchester City to the final day of the season. Despite winning 3 - 1 against Everton, results elsewhere meant they only finished fifth, missing out on a Champions League spot for the first time in two decades, and the first ever under Wenger. However, Arsenal won the FA Cup Final 2 - 1 against Chelsea, making it their third win in four seasons, and made them the most successful club in the history of the competition.
ground_truth: 1992
sub_queries: What trophy did Arsenal win in the 2003-2004 season without losing a match? Answer: Premier League
In what year was Premier League created? Answer: 1992