Question: population of the roman empire at its peak
[{'answer': '60 -- 70 million'}, {'provenance': [{'wikipedia_id': '27766105', 'title': 'Demography of the Roman Empire', 'start_paragraph_id': 2, 'start_character': 0, 'end_paragraph_id': 2, 'end_character': 431, 'bleu_score': 0.894445479139597, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 14808990809661832513}, 'section': 'Section::::Abstract.'}]}]