Question: what year did pancho and lefty come out
[{'answer': '1972', 'provenance': [{'wikipedia_id': '773571', 'title': 'Pancho and Lefty', 'start_paragraph_id': 1, 'start_character': 173, 'end_paragraph_id': 1, 'end_character': 177, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '773571', 'title': 'Pancho and Lefty', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 216, 'bleu_score': 0.948006874591591, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 14420091372894069096}, 'section': 'Section::::Abstract.'}]}]