Question: when was the metric system introduced in australia
[{'answer': '1966', 'provenance': [{'wikipedia_id': '2732143', 'title': 'Metrication in Australia', 'start_paragraph_id': 1, 'start_character': 46, 'end_paragraph_id': 1, 'end_character': 50, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '2732143', 'title': 'Metrication in Australia', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 327, 'bleu_score': 0.958740481558872, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 12663673433368890428}, 'section': 'Section::::Abstract.'}]}]