Question: when did red rum win the grand national
[{'answer': '1973', 'provenance': [{'wikipedia_id': '2545868', 'title': 'Red Rum', 'start_paragraph_id': 1, 'start_character': 157, 'end_paragraph_id': 1, 'end_character': 161, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'answer': '1974', 'provenance': [{'wikipedia_id': '2545868', 'title': 'Red Rum', 'start_paragraph_id': 1, 'start_character': 163, 'end_paragraph_id': 1, 'end_character': 167, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'answer': '1977', 'provenance': [{'wikipedia_id': '2545868', 'title': 'Red Rum', 'start_paragraph_id': 1, 'start_character': 172, 'end_paragraph_id': 1, 'end_character': 176, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '2545868', 'title': 'Red Rum', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 440, 'bleu_score': 0.8547468657171841, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 12291792140384494334}, 'section': 'Section::::Abstract.'}]}]