Question: how many millionares are there in the usa
[{'answer': 'just over 15 million'}, {'provenance': [{'wikipedia_id': '386115', 'title': 'Millionaire', 'start_paragraph_id': 3, 'start_character': 0, 'end_paragraph_id': 3, 'end_character': 275, 'bleu_score': 0.755407315612855, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 14003450489454995336}, 'section': 'Section::::Abstract.'}]}]