The second game of the Bears-Vikings rivalry took place in Minneapolis and was the third game at TCF Bank Stadium; the Bears won the first game in 2010 while the Vikings won in 2014. To succeed against the Vikings, Jeff Joniak writes that the Bears had to excel at the start of the game; offensively, the Bears had a first quarter scoring differential of -48, 31st in the league, while scoring only twice on game-opening possessions. In the third quarter, the Bears scored a league-worst 32 points; in comparison, the Vikings defense had allowed only one touchdown on opening drives and a league-low 37 points in the third quarter. The defense took on a Vikings offense spearheaded by Adrian Peterson, whose 1,251 yards led the league. On special teams, the Vikings led the league in post-kickoff starting position, while being ranked third in returns of at least 20 yards with 26 and first in returns of at least 40 yards with five. Additionally, kickoff returner Cordarrelle Patterson led the league in return average with 31.1 yards. Christian Jones, Cameron Meredith, Bryce Callahan, Nick Becton, Tayo Fabuluje, Jacoby Glenn and Antone Smith were inactive. The Vikings won the toss and deferred. Despite a 49-yard kick return by Deonte Thompson, the Bears' struggles began quickly, with the drive stalling after a holding penalty on Hroniss Grasu and a sack. Afterwards, the Vikings scored on their first drive when Stefon Diggs beat Tracy Porter to score on a 15-yard touchdown. The Vikings increased the score with Blair Walsh's 53-yard field goal in the second quarter. After the next two drives ended with punts, Alshon Jeffery caught a ten-yard touchdown pass from Jay Cutler to draw the Bears within three points. On the following series, the Vikings responded when Teddy Bridgewater escaped a blitz to throw a pass to Jerick McMcKinnon, who beat Shea McClellin to score on the 17-yard play. To start the second half, the Bears attempted an onside kick, and Sherrick McManis recovered. However, after three plays, Brian Robison sacked and stripped Jay Cutler, recovering the fumble; Minnesota took advantage with Stefon Diggs beating Alan Ball to score on the 33-yard touchdown. The Bears decreased the margin to two touchdowns when Robbie Gould kicked a 51-yard field goal; the next three consecutive drives concluded with punts. Afterwards, Cutler's screen pass to Matt Forte was intercepted by Justin Trattou, and the Vikings capitalized on the turnover with Bridgewater's 12-yard touchdown run, though the Bears retaliated with Cutler's four-yard touchdown pass to Forte. The Bears attempted another onside kick, but failed, and the Vikings later scored again on Zach Line's four-yard touchdown. With 1:50 left in the game, the Bears drove as far as the Vikings' 28-yard line, but time expired. The loss dropped the Bears to 5-9 and officially eliminated them from playoff contention. Cutler's touchdown pass to Jeffery was his 200th career touchdown pass, while the onside kick attempted at the start of the third quarter was Gould's first successful kick in his eleven-year career with the Bears.
Question: How many years did it take for the Vikings to beat the Bears at the TCF Bank Stadium?
Answer: 4