Question: when did the log flume closed at alton towers
[{'answer': '2015', 'provenance': [{'wikipedia_id': '37400147', 'title': 'The Flume (Alton Towers)', 'start_paragraph_id': 1, 'start_character': 318, 'end_paragraph_id': 1, 'end_character': 322, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'answer': '10 October 2015'}, {'provenance': [{'wikipedia_id': '37400147', 'title': 'The Flume (Alton Towers)', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 414, 'bleu_score': 0.9495650599702361, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 10895746081858787908}, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '37400147', 'title': 'The Flume (Alton Towers)', 'section': 'Section::::Abstract.', 'start_paragraph_id': 1, 'end_paragraph_id': 1, 'meta': {'evidence_span': ['2015', "The ride was a bath time themed log flume with three drops. It was the longest log flume attraction in the world at the time of opening. The attraction closed in 2015 and was removed a year later for the area's redevelopment into the Wicker Man rollercoaster.", 'The attraction closed in 2015']}}]}]