Question: when was the marina bay sands hotel built
[{'answer': '23 and 24 June 2010', 'provenance': [{'wikipedia_id': '5299184', 'title': 'Marina Bay Sands', 'start_paragraph_id': 2, 'start_character': 461, 'end_paragraph_id': 2, 'end_character': 480, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '5299184', 'title': 'Marina Bay Sands', 'start_paragraph_id': 2, 'start_character': 412, 'end_paragraph_id': 2, 'end_character': 1000, 'bleu_score': 0.946668591300401, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 3943042536801280414}, 'section': 'Section::::Abstract.'}]}]