Question: U.S. Bank Stadium opened in time for what season of the Vikings in the NFL?
Context: Downtown East is an official neighborhood in Minneapolis, Minnesota, United States part of the larger Central community.  Its boundaries are the Mississippi River to the north, Interstate 35W to the east, 5th Street South to the south, and Portland Avenue to the west.  It is bounded by the Downtown West, Elliot Park, and Cedar-Riverside neighborhoods.  The Marcy-Holmes neighborhood is on the other side of the river, but there is no direct automobile connection between the two neighborhoods.  There is a pedestrian and bicycle connection via the Stone Arch Bridge.  Downtown East was home to the Hubert H. Humphrey Metrodome, where the Minnesota Twins (MLB baseball), Minnesota Vikings (NFL football), and Minnesota Gophers (NCAA University of Minnesota football) have all played home games.  As of 2009, the Minnesota Golden Gophers moved into the new TCF Bank Stadium on the University of Minnesota Campus.  Additionally, the Minnesota Twins moved into new Target Field at the start of the 2010 season.  In 2016, U.S. Bank Stadium opened on the Metrodome's former site. U.S. Bank Stadium is a fixed-roof stadium in the north central United States, located in the Downtown East neighborhood of Minneapolis, Minnesota.  Built on the former site of the Hubert H. Humphrey Metrodome, the indoor stadium opened in 2016 and is the home of the Minnesota Vikings of the National Football League (NFL); it also hosts early season college baseball games of the University of Minnesota Golden Gophers (NCAA). The 2013 Minnesota Vikings season was the franchise's 53rd season in the National Football League.  It also marked the Vikings' final season playing their home games at the Hubert H. Humphrey Metrodome; the team played their home games at TCF Bank Stadium for the 2014 and 2015 seasons while construction of U.S. Bank Stadium, which opened in 2016, took place on the site of the Metrodome.  Following a Week 9 loss to the Dallas Cowboys, the Vikings were no longer able to match their 10–6 record from 2012, and their loss to the Baltimore Ravens five weeks later sealed their elimination from playoff contention. The Minnesota Vikings Cheerleaders are the official cheer squad for the Minnesota Vikings.  The squad performs at every home game at the U.S. Bank Stadium, the home stadium of Minnesota.  Before the squad's introduction in 1984, The Vi-Queens (1961–63) and the St. Louis Park High School Parkettes performed (1964–83).  In 1984, the MVC were started.  The group currently has 35 members.  The squad, like other groups in the league, releases a swimsuit calendar annually since 2001.  The squad also makes off-field appearances at parades, schools, and charity events.  Like other NFL cheerleading squads, the MVC also has a "Junior Minnesota Vikings Cheerleaders" program, which has various divisions: Junior Angel Division is for girls aged 3–5, and Junior Cheerleader Division is for girls aged 6–14.  In April, the MVC hosts tryouts at Winter Park. The 2017 season is the Minnesota Vikings' 57th in the National Football League, and the fourth under head coach Mike Zimmer.  The Vikings will attempt to make history as the first team to play the Super Bowl on their home field, U.S. Bank Stadium.  For the first time since the 2006 season, running back Adrian Peterson will not be on the roster. The 2015 season was the Minnesota Vikings' 55th season in the National Football League and their second under head coach Mike Zimmer.  It marked the last season in which the Vikings played their home games at the University of Minnesota's on-campus TCF Bank Stadium, before moving into U.S. Bank Stadium, which is to open in July 2016, located on the site of the now-demolished Hubert H. Humphrey Metrodome.  The Vikings improved on their 7–9 mark from last season and clinched a playoff berth for the first time since 2012.  They also won their first NFC North title since 2009 with a Week 17 victory at the Packers.  As a result, they hosted the Seattle Seahawks in the wild card round of the 2015–16 NFL playoffs, but lost 10–9 after kicker Blair Walsh missed a potential game-winning, 27-yard field goal in the final seconds. The Minnesota Vikings are an American football team based in Minneapolis, Minnesota.  The Vikings joined the National Football League (NFL) as an expansion team in 1960, and first took the field for the 1961 season.  The team competes in the National Football Conference (NFC) North division; before that, the Vikings were in the NFC Central, and before that they were in the NFL's Western Conference Central Division.  The team has played in four Super Bowl games, but have not won one.  They were the NFL champions in 1969.  The team plays its home games at U.S. Bank Stadium in the Downtown East section of Minneapolis. The Minnesota Vikings season was the franchise's 54th season in the National Football League and the first under head coach Mike Zimmer.  It was the first of two seasons in which the Vikings played at the outdoor TCF Bank Stadium on the campus of the University of Minnesota.  Construction of U.S. Bank Stadium began on the site of the Hubert H. Humphrey Metrodome, with a target of opening for the 2016 season. The 2016 season was the Minnesota Vikings' 56th in the National Football League and the third under head coach Mike Zimmer. TCF Bank Stadium is an outdoor stadium located on the campus of the University of Minnesota in Minneapolis, Minnesota, United States.  Opened in 2009, it is the home field of the Minnesota Golden Gophers of the Big Ten Conference, and the temporary home of Minnesota United FC of Major League Soccer.  The stadium also served as the temporary home of the Minnesota Vikings of the National Football League (NFL) for the 2014 and 2015 seasons during the construction of U.S. Bank Stadium.  The 50,805-seat "horseshoe" style stadium cost $303.3 million to build and is designed to support future expansion to seat up to 80,000.
Answer: 56th