Question: when did bruce forsyth finish strictly come dancing
[{'answer': '2013', 'provenance': [{'wikipedia_id': '147505', 'title': 'Bruce Forsyth', 'start_paragraph_id': 2, 'start_character': 304, 'end_paragraph_id': 2, 'end_character': 308, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}]