Question: where do the most shark attacks occur in the world
[{'answer': 'United States', 'provenance': [{'wikipedia_id': '427288', 'title': 'Shark attack', 'start_paragraph_id': 6, 'start_character': 47, 'end_paragraph_id': 6, 'end_character': 60, 'bleu_score': 1.0, 'section': 'Section::::Statistics.\n'}]}, {'provenance': [{'wikipedia_id': '427288', 'title': 'Shark attack', 'start_paragraph_id': 6, 'start_character': 0, 'end_paragraph_id': 6, 'end_character': 508, 'bleu_score': 0.977897140678983, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 4314609203075712572}, 'section': 'Section::::Statistics.\n'}]}]