Question: when is the last time the federal minimum wage was raised
[{'answer': 'October 2016', 'provenance': [{'wikipedia_id': '11477230', 'title': 'Minimum wage in the United States', 'start_paragraph_id': 96, 'start_character': 6, 'end_paragraph_id': 96, 'end_character': 18, 'bleu_score': 1.0, 'section': 'Section::::List by jurisdiction.:State.\n'}]}, {'provenance': [{'wikipedia_id': '11477230', 'title': 'Minimum wage in the United States', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 571, 'bleu_score': 0.5715187610325, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 9695101526412872663}, 'section': 'Section::::Abstract.'}]}]