Question: when was the last time the debt ceiling was raised
[{'answer': 'October 30 , 2015', 'provenance': [{'wikipedia_id': '32656127', 'title': 'History of United States debt ceiling', 'start_paragraph_id': 33, 'start_character': 20, 'end_paragraph_id': 33, 'end_character': 42, 'bleu_score': 1.0, 'section': 'Section::::Historical debt ceiling levels.\n'}]}, {'provenance': [{'wikipedia_id': '32656127', 'title': 'History of United States debt ceiling', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 669, 'bleu_score': 0.9822204502117851, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 18091757502625176298}, 'section': 'Section::::Abstract.'}]}]