Question: when did great britain win the davis cup
[{'answer': '2015', 'provenance': [{'wikipedia_id': '9662168', 'title': 'Great Britain Davis Cup team', 'start_paragraph_id': 3, 'start_character': 117, 'end_paragraph_id': 3, 'end_character': 121, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '9662168', 'title': 'Great Britain Davis Cup team', 'start_paragraph_id': 16, 'start_character': 0, 'end_paragraph_id': 16, 'end_character': 745, 'bleu_score': 0.9214280862147991, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 1220068646184285761}, 'section': 'Section::::History.:Resurgence under Leon Smith (2010–present).\n'}]}]