Question: The 2017–18 Serie B (known as the Serie B ConTe.it for sponsorship reasons) is the 86th season since its establishment in 1929, a total of 22 teams are contesting the league: 15 returning from the 2016–17 season, The 2016–17 Serie B, known as the Serie B ConTe.it for sponsorship reasons, and was the 85th season since its establishment in, what year?
Sentence (from "2012–13 Serie B"): A total of 22 teams will contest the league: 15 of which returning from the 2011–12 season, 4 of which promoted from Lega Pro Prima Divisione, and three relegated from Serie A.
Relevant evidence: No