Question: when did the dallas cowboys last beat the denver broncos
[{'answer': '1977', 'provenance': [{'wikipedia_id': '8122', 'title': 'Denver Broncos', 'start_paragraph_id': 2, 'start_character': 166, 'end_paragraph_id': 2, 'end_character': 170, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '8122', 'title': 'Denver Broncos', 'start_paragraph_id': 9, 'start_character': 0, 'end_paragraph_id': 9, 'end_character': 446, 'bleu_score': 0.808436620023098, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 14976889072619964334}, 'section': 'Section::::Franchise history.:1970–1982.\n'}]}]