Question: when did the chicago bears become a team
[{'answer': '1919', 'provenance': [{'wikipedia_id': '6611', 'title': 'Chicago Bears', 'start_paragraph_id': 6, 'start_character': 127, 'end_paragraph_id': 6, 'end_character': 131, 'bleu_score': 1.0, 'section': 'Section::::Franchise history.:1920–1939: Early Bears.\n'}]}, {'provenance': [{'wikipedia_id': '6611', 'title': 'Chicago Bears', 'start_paragraph_id': 2, 'start_character': 0, 'end_paragraph_id': 2, 'end_character': 485, 'bleu_score': 0.9353868346438581, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 4828887270046232953}, 'section': 'Section::::Abstract.'}]}]