Question: how much of the us population is vegetarian
[{'answer': '3.4 %', 'provenance': [{'wikipedia_id': '6946102', 'title': 'Vegetarianism by country', 'start_paragraph_id': 74, 'start_character': 214, 'end_paragraph_id': 74, 'end_character': 219, 'bleu_score': 1.0, 'section': 'Section::::North America.:United States.\n'}]}]