Question: when did the milwaukee bucks win the nba championship
[{'answer': '1971', 'provenance': [{'wikipedia_id': '4875159', 'title': '1971 NBA Finals', 'start_paragraph_id': 0, 'start_character': 0, 'end_paragraph_id': 0, 'end_character': 4, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '4875159', 'title': '1971 NBA Finals', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 418, 'bleu_score': 0.8098749945654861, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 3431540681563757320}, 'section': 'Section::::Abstract.'}]}]