Question: The 1988 FA Cup Final was the culmination of season number what of the Football League?

Context paragraphs:
2008 FA Cup Final: The 2008 FA Cup Final was a football match held at Wembley Stadium on 17 May 2008 and was the final match of the 2007–08 FA Cup competition.  The match was the 127th FA Cup Final, and the second to be held at the new Wembley Stadium since its redevelopment.  The match was contested by Portsmouth and Cardiff City, with Portsmouth winning 1–0.  This was the first time that the two sides have ever met in the competition.  Both teams were aiming to win the FA Cup for the second time, Cardiff having won it in 1927 and Portsmouth in 1939.  Had Cardiff won, they would have been the first club from outside the top division of English football to have won the competition since West Ham United in 1980.  The match had an attendance of 89,874, a record which still stands as the largest ever for an FA Cup Final at the new Wembley Stadium.

2013 FA Cup Final: The 2013 FA Cup Final was the 132nd final of the FA Cup, the world's oldest football cup competition.  The match, contested by Manchester City and Wigan Athletic, took place on 11 May 2013 at Wembley Stadium in London, and kicked off at 5:15 p.m.  It was Wigan's first FA Cup final and Manchester City's 10th.  Wigan pulled off a shock victory against favourites City, winning in circumstances reminiscent of the 1988 FA Cup Final when Wimbledon overcame Liverpool.  Ben Watson's stoppage-time headed goal produced the "greatest FA Cup Final upset for a quarter of a century".  In the United Kingdom, the match was televised by ITV and ESPN.

List of Sunderland A.F.C. seasons: Sunderland Association Football Club was founded in 1879 as Sunderland & District Teachers Association Football Club by James Allan.  They turned professional in 1885.  Sunderland won their first Football League championship in the 1891–92 season two years after joining the league.  They won the next Football League First Division on three occasions in four seasons; in 1892, 1893 and 1895, separated by a runner-up spot in 1894.  In the 1901–02 season, Sunderland won their fifth Football League First Division championship.  They came close to completing the "league and cup double" in the 1912–13 season, winning the league but losing to Aston Villa in the 1913 FA Cup Final.  The team's next success came in the 1935–36 season when they won the League Championship and also the Charity Shield.  They had not won the FA Cup until the 1936–37 season when they defeated Preston North End in the 1937 FA Cup Final.  Sunderland entered The Football League in 1890 and were not relegated from the top division until the 1957–58 season; a total of 58 seasons in the highest division of England.  Their next trophy came in the 1973 FA Cup Final as they beat Leeds United 1–0.  They reached the 1985 Football League Cup Final but finished as runners-up to Norwich City after being beaten 1–0.  In the 1986–87 season Sunderland were relegated to the Football League Third Division for the first time in their history under the management of Lawrie McMenemy, they however, returned to the second division the following season as champions–their lowest position in the English football league system.  Their first appearance in the Premier League came in the 1999–2000 season after being promoted as champions from Division One.  In winning promotion the club gained 105 points, which was a record at the time.  Sunderland gained just 15 points in the 2005-06 season, which set the record for the lowest number of points in a Premier League season, which has since been eclipsed by Derby County.

1994 FA Cup Final: The 1994 FA Cup Final was the 49th FA Cup final to be held since the Second World War and was contested between Manchester United and Chelsea.  United went into the final as Premier League champions, having won the title by eight points over Blackburn Rovers.  They were bidding to become only the fourth team of the 20th century to complete "the Double" and the first in their own history.  Chelsea, on the other hand, were playing in their first FA Cup Final since 1970 and first major final since the 1972 Football League Cup Final; they also finished 14th in the Premier League.

1988 FA Cup Final: The 1988 FA Cup Final was the 107th final of the FA Cup.  It took place on 14 May 1988 at Wembley Stadium and was contested between Wimbledon and Liverpool, the dominant English club side of the 1980s and newly crowned league champions.

1987–88 Football League: The 1987–1988 season was the 89th completed season of The Football League.

1970 FA Cup Final: The 1970 FA Cup Final was contested by Chelsea and Leeds United.  The match took place on 11 April 1970 at Wembley Stadium and ended 2–2, making it the first FA Cup final to require a replay since 1912.  The replay was staged at Old Trafford and played on 29 April; after four hours of fiercely contested football, Chelsea eventually won 2–1.  As of 2016, both the final and replay were the last times that FA Cup final ties were played in the month of April; all subsequent FA Cup final ties have been played in the month of May.

2014 FA Cup Final: The 2014 FA Cup Final was the 133rd final of the FA Cup, the world's oldest football cup competition.  The match was contested between Arsenal and Hull City at Wembley Stadium on 17 May 2014.  Hull City made their first appearance in an FA Cup Final, while Arsenal equalled Manchester United's record of 18 final appearances.  It was the first time since 2010 that the FA Cup Final had taken place after the end of the Premier League season.

2007 FA Cup Final: The 2007 FA Cup Final was played on Saturday, 19 May 2007 between Chelsea and Manchester United.  It was the 126th FA Cup Final and the first to be played at the new Wembley Stadium.  Manchester United suffered a 1–0 defeat to Chelsea by Didier Drogba's extra time goal, completing a domestic cup double for the Blues in the 2006–07 season, as they had already won the League Cup Final in February .  While United were favourite for playing a double of their own as they had recently beaten Chelsea to the Premier League title two weeks earlier.  The game was widely considered to be a disappointment by pundits and fans alike.  As a result of Manchester United and Chelsea having already been guaranteed qualification for the UEFA Champions League, the UEFA Cup entry for the FA Cup winner/runner-up went instead to the highest positioned Premier League team who hadn't already qualified for Europe: Bolton Wanderers.

1988 FA Charity Shield: The 1988 FA Charity Shield was the 66th Charity Shield, a football match contested by the winners of the previous season's Football League and FA Cup competitions.  The match was played on 20 August 1988 between 1987–88 Football League champions Liverpool and 1987–88 FA Cup winners Wimbledon.

Supporting paragraphs: 1988 FA Cup Final 1987–88 Football League
Answer: the 89th completed season