Question: when did the book polar express come out
[{'answer': '1985', 'provenance': [{'wikipedia_id': '982237', 'title': 'The Polar Express', 'start_paragraph_id': 1, 'start_character': 122, 'end_paragraph_id': 1, 'end_character': 126, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '982237', 'title': 'The Polar Express', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 423, 'bleu_score': 0.8770359524899021, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 11522730337354323107}, 'section': 'Section::::Abstract.'}]}]