Question: when was the last time tottenham beat chelsea at stamford bridge
[{'answer': '2 May 2016', 'provenance': [{'wikipedia_id': '52113299', 'title': 'Chelsea F.C.–Tottenham Hotspur F.C. rivalry', 'start_paragraph_id': 13, 'start_character': 3, 'end_paragraph_id': 13, 'end_character': 13, 'bleu_score': 1.0, 'section': 'Section::::History.\n'}]}, {'provenance': [{'wikipedia_id': '52113299', 'title': 'Chelsea F.C.–Tottenham Hotspur F.C. rivalry', 'start_paragraph_id': 13, 'start_character': 0, 'end_paragraph_id': 13, 'end_character': 766, 'bleu_score': 0.7539527604153231, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 8912744324882131509}, 'section': 'Section::::History.\n'}]}]