Question: when did mps last get a pay rise
[{'answer': '8 May 2015', 'provenance': [{'wikipedia_id': '22879440', 'title': 'Salaries of Members of the United Kingdom Parliament', 'start_paragraph_id': 8, 'start_character': 332, 'end_paragraph_id': 8, 'end_character': 342, 'bleu_score': 1.0, 'section': 'Section::::Salary and benefits: Commons.:Basic salary.\n'}]}, {'provenance': [{'wikipedia_id': '22879440', 'title': 'Salaries of Members of the United Kingdom Parliament', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 461, 'bleu_score': 0.7126923565220941, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 1528463222900570721}, 'section': 'Section::::Abstract.'}]}]