Question: what is the capacity of optus stadium perth
[{'answer': 'over 60,000 people', 'provenance': [{'wikipedia_id': '17322361', 'title': 'Perth Stadium', 'start_paragraph_id': 1, 'start_character': 266, 'end_paragraph_id': 1, 'end_character': 284, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '17322361', 'title': 'Perth Stadium', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 464, 'bleu_score': 0.940033794885305, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 12737761814849898079}, 'section': 'Section::::Abstract.'}]}]