Question: when was the last time australia held the commonwealth games
[{'answer': '2018', 'provenance': [{'wikipedia_id': '4522015', 'title': 'Australia at the Commonwealth Games', 'start_paragraph_id': 3, 'start_character': 91, 'end_paragraph_id': 3, 'end_character': 95, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}]