Including the old First Division before it became the Premier League, they have won the League 20 times up to the end of the 2013/2014 season.
They won the First Division 7 times:
1907-08, 1910-11, 1951-52, 1955-56, 1956-57, 1964-65 and 1966-67.
Since it became the Premier League, they have won it 13 times:
1992-93, 1993-94, 1995-96, 1996-97, 1998-99, 1999-2000, 2000-01, 2002-03, 2006-07, 2007-08, 2008-09, 2010-11 and 2012-13.
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They've now won 10 Premier League titles, adding to their seven old Division One titles.