Question: when was the department of the navy established
[{'answer': 'April 30 , 1798', 'provenance': [{'wikipedia_id': '797334', 'title': 'United States Department of the Navy', 'start_paragraph_id': 1, 'start_character': 82, 'end_paragraph_id': 1, 'end_character': 98, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '797334', 'title': 'United States Department of the Navy', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 1033, 'bleu_score': 0.9685088384824421, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 17356425033919996925}, 'section': 'Section::::Abstract.'}]}]