Question: The 1991 Chicago Bears season ended with a playoff loss for their coach, who was inducted into the Pro Football Hall of Fame in what year?

Context paragraphs:
2011 Chicago Bears season: The 2011 Chicago Bears season was the franchise's 92nd overall season in the National Football League, and the 8th under head coach Lovie Smith.  The Bears, defending NFC North Division champions, attempted a return to the playoffs after falling in the NFC Championship Game to their arch-rivals the Green Bay Packers.  The club was scheduled to partake in the Pro Football Hall of Fame Game but due to the lockout, the game was cancelled.  The Bears traveled to Wembley Stadium in London to take on the Tampa Bay Buccaneers in the NFL International Series and played the Packers on Christmas Day evening in the only scheduled game on that day.  The Bears finished the season with an 8–8 record and did not qualify for the playoffs to date.

Kurt Warner: Kurtis Eugene Warner (born June 22, 1971) is a former American football quarterback, a current part-time TV football analyst, and a philanthropist.  He played for three National Football League (NFL) teams: the St. Louis Rams, the New York Giants, and the Arizona Cardinals.  He was originally signed by the Green Bay Packers as an undrafted free agent in 1994 after playing college football at Northern Iowa.  Warner went on to be considered the best undrafted NFL player of all time, following a 12-year career regarded as one of the greatest stories in NFL history.  Warner was inducted into the Pro Football Hall of Fame in 2017, and is the only person inducted into both the Pro Football Hall of Fame and the Arena Football Hall of Fame.

1925 Chicago Bears season: The 1925 Chicago Bears season was their sixth regular season completed in the National Football League.  The club posted a 9–5–3 record under head coach George Halas earning them a seventh-place finish in the team standings, their worst showing to that date.  However, the 1925 Bears were the most notable team in the young NFL's history to that point—all because of the addition of college star Red Grange.  The Bears started slow, just like in 1924, starting the season with two ties and a loss to Green Bay (the Packers' first win ever over the Bears).  The Bears regrouped, however, and won 6 of their next 7.  More importantly, the college season ended in mid-November and the Bear's owner Halas signed Grange.  Grange was under contract but did not play on November 22 as the Bears defeated the Packers in a rematch.  When Grange did suit up for his first game on Thanksgiving Day against the Cardinals, an estimated 39,000 showed up to see a 0–0 tie.  (A large crowd at that time was about 10,000 fans and most games had less than 5,000 paying customers).  That was just the beginning of 7 games in 18 days for Grange and the Bears, most to enormous crowds.  Over 70,000 showed up on December 6 to see the Bears beat the Giants at the Polo Grounds—this was by far the largest crowd to see a professional football team and the gate receipts saved an ailing Giants franchise.  By the end of the whirlwind football tour, the Bears were exhausted and feebly dropped their last three games, only scoring 6 points total.  Even the lowly Detroit Panthers easily defeated the mighty Bears.  Still, Chicago's success spurred by Grange put the NFL on the "map" and may have saved the league from an early demise.

2010 Chicago Bears season: The 2010 Chicago Bears season was the franchise's 91st season overall in the National Football League.  Coming off a disappointing 7–9 record in the 2009 season and failing to qualify for the NFL playoffs for a third consecutive season, the Bears sought to develop their roster and improve on their record in 2010, particularly their standing in the NFC North.  All Bears home games were scheduled to be played at Soldier Field.  With their final regular season record at 11–5, the Bears improved drastically on their 2009 record.  Their regular season finished with their first playoff appearance since the Super Bowl season of 2006, winning the NFC North division and earning a bye as the NFC's second seed.  The Bears won their first game in the Divisional round of the playoffs, defeating the Seattle Seahawks on January 16, 2011, to advance to the NFC Championship game.  The Chicago Bears's 2010 season came to an end January 23, 2011 with a 21–14 loss to their longtime rivals and eventual Super Bowl champion Green Bay Packers in the NFC Championship Game.

1991 Chicago Bears season: The 1991 Chicago Bears season was their 72nd regular season and 21st postseason completed in the National Football League (NFL).  The Bears returned to the playoffs for a second consecutive season as one of three NFC Wild Cards, finishing with an 11–5 record and in second place in the NFC Central.  They were beaten, however, by the Dallas Cowboys in their first playoff game.  This was Mike Ditka's last playoff game as a head coach.

Mike Ditka: Michael Keller Ditka (born Michael Dyczko; October 18, 1939) is a former American football player, coach, and television commentator.  A member of both the College Football (1986) and Pro Football Hall of Fame (1988), he was the 1961 UPI NFL Rookie of Year, a five-time Pro Bowl selection and five-time All-Pro tight end with the Chicago Bears, Philadelphia Eagles, and Dallas Cowboys of the National Football League (NFL).

Mike Singletary: Michael Singletary (born October 9, 1958) is an American football coach and former professional football player.  After playing college football for Baylor University, Singletary was drafted by the Chicago Bears in the 2nd round of the 1981 NFL Draft and was known as "The Heart of the Defense" for the Chicago Bears' Monsters of the Midway in the mid-1980s.  He was inducted into the Pro Football Hall of Fame in 1998.  Singletary later pursued a career as a coach, first as a linebackers coach for the Baltimore Ravens, then as the linebackers coach for the San Francisco 49ers.  In 2008, the 49ers promoted Singletary to the head coaching position after previous head coach Mike Nolan was fired during the season, and he remained in that position until he was fired after the 49ers were eliminated from the playoffs with one game remaining in the 2010 season.

Art Anderson: Arthur Anthony Anderson (born October 9, 1936) is a former professional American football offensive tackle in the National Football League.  He is one of the few tackles to prevent Pro Football Hall of Fame inductee Deacon Jones from accomplishing any sacks in a game (1961 season).  His teammates on the Chicago Bears under George Halas included Stan Jones and 1961 rookie Mike Ditka, both Pro Football Hall of Fame inductees.

Walter Payton: Walter Jerry Payton (July 25, 1954 – November 1, 1999) was an American football running back who played for the Chicago Bears of the National Football League (NFL) for thirteen seasons.  Payton was known around the NFL as "Sweetness".  A nine-time Pro Bowl selectee, Payton is remembered as a prolific rusher, once holding records for career rushing yards, touchdowns, carries, yards from scrimmage, all-purpose yards, and many other categories.  He was also versatile, and retired with the most receptions by a non-receiver, and had eight career touchdown passes.  He was elected into the Pro Football Hall of Fame in 1993 and the College Football Hall of Fame in 1996.  Hall of Fame NFL player and coach Mike Ditka described Payton as the greatest football player he had ever seen—but even greater as a human being.

List of Chicago Bears first-round draft picks: The Chicago Bears are an American football franchise based in Chicago, Illinois.  They are members of the National Football Conference (NFC) North division in the National Football League (NFL).  They participated in the first ever NFL draft in 1936 and selected Joe Stydahar, an tackle from the West Virginia University.  Stydahar went to have a stellar career with the franchise and is inducted in the Pro Football Hall of Fame.  The team's most recent first round selection (2015) was Leonard Floyd, a outside linebacker from Georgia.  The Bears have not had first round selections a total of six times, most recently in 2010 draft.  The Bears have only selected the number one overall pick in the draft twice, choosing Tom Harmon in 1941 and Bob Fenimore in 1947.  The team's six selections from the University of Texas are the most chosen by the Bears from one program.  Nine of the first round selections have been inducted into the Pro Football Hall of Fame.

Supporting paragraphs: 1991 Chicago Bears season Mike Ditka
Answer: 1988