Question: when did they build the empire state building
[{'answer': '1931', 'provenance': [{'wikipedia_id': '9736', 'title': 'Empire State Building', 'start_paragraph_id': 1, 'start_character': 156, 'end_paragraph_id': 1, 'end_character': 160, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '9736', 'title': 'Empire State Building', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 552, 'bleu_score': 0.765806620456283, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 7662771735269489231}, 'section': 'Section::::Abstract.'}]}]