Question: when did michigan last win a national championship
[{'answer': '1989'}, {'provenance': [{'wikipedia_id': '14291424', 'title': "Michigan Wolverines men's basketball", 'start_paragraph_id': 0, 'start_character': 0, 'end_paragraph_id': 0, 'end_character': 0, 'bleu_score': 1.0, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 6684634485301610391}, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '22526195', 'title': "198889 Michigan Wolverines men's basketball team", 'section': 'Section::::Abstract.', 'start_paragraph_id': 1, 'end_paragraph_id': 1, 'meta': {'evidence_span': ["he 198889 Michigan Wolverines men's basketball team represented the University of Michigan in intercollegiate college basketball during the 198889 season. The head coach was Bill Frieder, who was dismissed before the 1989", "The 198889 Michigan Wolverines men's basketball team represented the University of Michigan in intercollegiate college basketball during the 198889 season. The head coach was Bill Frieder, who was dismissed before the 1989 NCAA Men's Division I Basketball Tournament and replaced by assistant Steve Fisher. They played their home games at Crisler Arena in Ann Arbor, Michigan as members of the Big Ten Conference. They finished the season 307, 126 in Big Ten play to finish in third place. The Wolverines received an at-large bid to the NCAA Tournament as the No. 3 seed in the Southeast region. They defeated Xavier and South Alabama to advance to the Sweet Sixteen. In the Sweet Sixteen, they defeated No. 5-ranked North Carolina and Virginia to advance to the Final Four. In the Final Four, they defeated fellow Big Ten member and No. 3-ranked Illinois to advance to the National Championship game. There they defeated No. 11 Seton Hall in overtime to win the school's first and, to date, only National Championship."]}}]}, {'provenance': [{'wikipedia_id': '14291424', 'title': "Michigan Wolverines men's basketball", 'section': 'Section::::Postseason.:NCAA Tournament results.\n', 'start_paragraph_id': 169, 'end_paragraph_id': 169, 'meta': {'evidence_span': ['The University of Michigan has an all-time 6128* (5424) record overall and 16* (14) championship game record in the NCAA Tournaments in 29* (25) appearances. Glen Rice holds the NCAA single-tournament scoring record with 184 points in 1989.', "The University of Michigan has an all-time 6128* (5424) record overall and 16* (14) championship game record in the NCAA Tournaments in 29* (25) appearances. Glen Rice holds the NCAA single-tournament scoring record with 184 points in 1989. The 1992 Final Four and all 1993, 1996, & 1998 games have been forfeited due to NCAA sanctions. The NCAA began seeding the NCAA Division I Men's Basketball Tournament with the 1979 edition. The 64-team field started in 1985, which guaranteed that a championship team had to win six games. In 10* (9) National Invitation Tournament appearances, Michigan is 25*7 (207) overall all-time and 3*1 (21) in the championship game. 16*0 (140) at Crisler", 'Glen Rice holds the NCAA single-tournament scoring record with 184 points in 1989']}}]}, {'provenance': [{'wikipedia_id': '6142330', 'title': 'Michigan Wolverines football', 'section': 'Section::::Abstract.', 'start_paragraph_id': 2, 'end_paragraph_id': 2, 'meta': {'evidence_span': ['recently that of the 1997 squad voted atop the final AP Poll. From 1900 to 1989,', 'sports rivalry. Michigan began competing in intercollegiate football in 1879. The Wolverines joined the Big Ten Conference at its inception in 1896, and other than a hiatus from 1907 to 1916, have been members since. Michigan has won or shared 42 league titles, and, since the inception of the AP Poll in 1936, has finished in the top 10 a total of 38 times. The Wolverines claim 11 national championships, most recently that of the 1997 squad voted atop the final AP Poll. From 1900 to 1989, Michigan', 'The Wolverines claim 11 national championships, most recently that of the 1997 squad voted atop the final AP Poll. From 1900 to 1989, Michigan']}}]}]