Question: who calculates the consumer price index on a monthly basis in the usa
[{'answer': 'Bureau of Labor Statistics', 'provenance': [{'wikipedia_id': '6688374', 'title': 'United States Consumer Price Index', 'start_paragraph_id': 1, 'start_character': 103, 'end_paragraph_id': 1, 'end_character': 129, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '6688374', 'title': 'United States Consumer Price Index', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 345, 'bleu_score': 0.9357293803829071, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 2620894595443062282}, 'section': 'Section::::Abstract.'}]}]