Question: when did the atlanta thrashers became the winnipeg jets
[{'answer': 'May 2011', 'provenance': [{'wikipedia_id': '70501', 'title': 'Atlanta Thrashers', 'start_paragraph_id': 2, 'start_character': 3, 'end_paragraph_id': 2, 'end_character': 11, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '70501', 'title': 'Atlanta Thrashers', 'start_paragraph_id': 2, 'start_character': 0, 'end_paragraph_id': 2, 'end_character': 623, 'bleu_score': 0.948261240454721, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 3062929978878315115}, 'section': 'Section::::Abstract.'}]}]