Question: The 2017–18 season is Middlesbrough's first season back in the Championship, making an immediate return to the division following relegation from the Premier League the 2016–17 Premier League was the 25th season of the Premier League, the top English professional league for association football clubs, since its establishment, in which year?

Context articles: 2017–18 Middlesbrough F.C. season
2015 Nigeria Professional Football League
2014–15 Norwich City F.C. season
2017–18 Premier League
Colchester United F.C. league record by opponent
2015–16 Premier League
2017–18 Egyptian Premier League
2014–15 Premier League
2016–17 Premier League
2016–17 Egyptian Premier League

The 2017–18 season is Middlesbrough's first season back in the Championship, making an immediate return to the division following relegation from the Premier League the previous season, in their 142nd year in existence.
 Along with the Championship, the club will also compete in the FA Cup and EFL Cup.
 The season covers the period from 1 July 2017 to 30 June 2018.
The 2015 Nigeria Professional Football League (referred to as the Nigerian Glo premier league for sponsorship reasons) is the 44th season of the Nigeria Premier League, the top Nigerian professional league for association football clubs, since its establishment in 1972, and the 25th since the rebranding of the league as the "Professional League".
The 2014–15 season was Norwich City Football Club's 113th season as a professional club.
 It was their first season back in the Football League Championship after their relegation from the Premier League in the 2013–14 season.
 Neil Adams began the season as manager, to embark on a first full season in charge, however this was not to be as he was replaced by Alex Neil in January 2015.
 Norwich started the League Cup in the second round and exited in the third round following a defeat at League Two side Shrewsbury Town, and were also eliminated in the FA Cup Third Round, following a defeat by Preston North End.
 Norwich finished third in the regular Championship season, qualifying for the play-offs.
 They were promoted back to the Premier League after a single season's absence by defeating Middlesbrough 2–0 in the play-off final.
The 2017–18 Premier League is the 26th season of the Premier League, the top English professional league for association football clubs, since its establishment in 1992.
 The season started on 11 August 2017 and is scheduled to finish on 13 May 2018.
 Fixtures for the 2017–18 season were announced on 14 June 2017.
Colchester United Football Club is an English professional football club based in Colchester, Essex, that was founded in 1937.
 From the 1937–38 season, the club played in the Southern Football League until 1950, when they were elected to the Football League.
 After playing in the Third Division South for eight seasons, Colchester remained in the Third Division when the league was re-organised by finishing 12th in 1958.
 The club were relegated to the Fourth Division in 1961, but made an immediate return to the Third Division after finishing the 1961–62 season in second position, one point behind Millwall.
 They bounced between the Third and Fourth divisions until 1990, when the club were relegated from the Football League for the first time in 40 years.
 After two seasons in the Football Conference, the U's were promoted back to the Football League after winning the Conference title on goal difference over Wycombe Wanderers in 1992.
 Colchester played in the Third Division between 1992 and 1998, when they won promotion to the Second Division after a play-off final win against Torquay United at Wembley.
 The club remained in the third tier until 2006, as they were promoted to the Championship, the second tier of English football, for the first time in their history, ending the season as runners up in League One to Southend United.
 The U's spent two seasons in the Championship, earning their highest-ever league finish of 10th position in the second tier before being relegated back to League One in 2008.
 Following relegation to League Two at the end of the 2015–16 season, Colchester made a return to the fourth tier of English football for the first time in 18-years.
The 2015–16 Premier League was the 24th season of the Premier League, the top English professional league for association football clubs, since its establishment in 1992.
 The season began on 8 August 2015, and was scheduled to conclude on 15 May 2016.
 However, the Manchester United vs Bournemouth fixture was postponed to 17 May 2016 on the final day due to a suspicious package inside Old Trafford.
The 2017–18 Egyptian Premier League is the 59th season of the Egyptian Premier League, the top Egyptian professional league for association football clubs, since its establishment in 1948.
 The season started on 8 September 2017 and is scheduled to finish in late May 2018.
 Fixtures for the 2017–18 season was announced on 30 August 2017.
The 2014–15 Premier League (also known as the Barclays Premier League for sponsorship reasons) was the 23rd season of the Premier League, the top English professional league for association football clubs, since its establishment in 1992.
 The fixtures were announced on 18 June 2014.
The 2016–17 Premier League was the 25th season of the Premier League, the top English professional league for association football clubs, since its establishment in 1992.
 The season began on 13 August 2016 and concluded on 21 May 2017.
 Fixtures for the 2016–17 season were announced on 15 June 2016.
The 2016–17 Egyptian Premier League (also known as the Obour Land Premier League for sponsorship reasons) was the 58th season of the Egyptian Premier League, the top Egyptian professional league for association football clubs, since its establishment in 1948.
 The season began on 15 September 2016 and concluded on 17 July 2017.
 Fixtures for the 2016–17 season were announced on 22 August 2016.