Question: during what decade did the genre of the western become established
[{'answer': '1960s', 'provenance': [{'wikipedia_id': '65758', 'title': 'Western (genre)', 'start_paragraph_id': 11, 'start_character': 84, 'end_paragraph_id': 11, 'end_character': 89, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '65758', 'title': 'Western (genre)', 'start_paragraph_id': 12, 'start_character': 0, 'end_paragraph_id': 12, 'end_character': 826, 'bleu_score': 0.7609834164558881, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 14654537063096853883}, 'section': 'Section::::Abstract.'}]}]