Question: how many vietnamese immigrants are in the united states
[{'answer': '2,067,527'}, {'provenance': [{'wikipedia_id': '316736', 'title': 'Vietnamese Americans', 'start_paragraph_id': 5, 'start_character': 0, 'end_paragraph_id': 5, 'end_character': 750, 'bleu_score': 0.517677278874347, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 4471089714119317879}, 'section': 'Section::::Demographics.\n'}]}]