Question: when did kevin de bruyne join manchester city
[{'answer': '30 August 2015', 'provenance': [{'wikipedia_id': '19570009', 'title': 'Kevin De Bruyne', 'start_paragraph_id': 31, 'start_character': 3, 'end_paragraph_id': 31, 'end_character': 17, 'bleu_score': 1.0, 'section': 'Section::::Club career.:Manchester City.:2015–16 season.\n'}]}, {'provenance': [{'wikipedia_id': '19570009', 'title': 'Kevin De Bruyne', 'start_paragraph_id': 31, 'start_character': 0, 'end_paragraph_id': 31, 'end_character': 789, 'bleu_score': 0.892217871122971, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 2232056510452857766}, 'section': 'Section::::Club career.:Manchester City.:2015–16 season.\n'}]}]