Chelsea last won the Premier League in 2010.
relegated into second division in 1975.
Chelsea was promoted back into the First division in 1976-77 only to be relegated again in 1978-79 spending the next 4 years in Second Division.
Chelsea have won the E.P.L four times.
2010, Chelsea was relgated in 2010
Chelsea were relegated from the Football League First Division in the 1987-88 season, finishing in eighteenth place, and were promoted from the Second Division in the 1988-89 season, finishing 17 points clear at the top of the Second Division table.
I believe it was the 1973/74 season. Man United, Norwich & Southampton were the 3 teams
They have never been relegated from the Premier League. Since the Premier League was founded in 1992 they ended 11th position in 1992/1993 but have never been relegated.
They were relegated this year.
wolves were relegated in the 1983-84 season