Question: when did back to the future take place
[{'answer': '1985', 'provenance': [{'wikipedia_id': '42993', 'title': 'Back to the Future', 'start_paragraph_id': 1, 'start_character': 24, 'end_paragraph_id': 1, 'end_character': 28, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '42993', 'title': 'Back to the Future', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 619, 'bleu_score': 0.539369362378269, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 1788994746412654137}, 'section': 'Section::::Abstract.'}]}]