Question: how many storage facilities are there in the united states
[{'answer': 'between 44,000 and 52,000', 'provenance': [{'wikipedia_id': '2682173', 'title': 'Self storage', 'start_paragraph_id': 2, 'start_character': 104, 'end_paragraph_id': 2, 'end_character': 129, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '2682173', 'title': 'Self storage', 'start_paragraph_id': 2, 'start_character': 0, 'end_paragraph_id': 2, 'end_character': 183, 'bleu_score': 0.8498644646741501, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 15022495751236834827}, 'section': 'Section::::Abstract.'}]}]