Question: when was hard rock hotel las vegas built
[{'answer': '1995', 'provenance': [{'wikipedia_id': '1642654', 'title': 'Hard Rock Hotel and Casino (Las Vegas)', 'start_paragraph_id': 4, 'start_character': 33, 'end_paragraph_id': 4, 'end_character': 37, 'bleu_score': 1.0, 'section': 'Section::::History.\n'}]}]