Question: when did the $2 coin come out in australia
[{'answer': '20 June 1988', 'provenance': [{'wikipedia_id': '4622384', 'title': 'Australian two dollar coin', 'start_paragraph_id': 1, 'start_character': 113, 'end_paragraph_id': 1, 'end_character': 125, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '4622384', 'title': 'Australian two dollar coin', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 254, 'bleu_score': 0.90152529474496, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 16382556959332168661}, 'section': 'Section::::Abstract.'}]}]